选择知识点

阅读理解。
Tornadoes are nature's most violent storms, which can cause deaths and destroy a neighborhood in seconds. A tornado appears as a funnel-shaped (漏斗状) cloud from a thunderstorm to the ground with whirling (飞快移动) winds that can reach 300 miles per hour. Damage paths can be over one mile wide and 50 miles long. Every state is at some risk from this disaster.
Some tornadoes can be seen clearly, while rain or nearby low-hanging clouds obscure others. At many times, tornadoes develop so rapidly that little, if any, advance warning is possible.
Before a tornado hits, the air may become very still. A cloud of debris (散片) can mark the location of a tornado even if a funnel can not be seen. Tornadoes generally occur near the edge of a thunderstorm, when the strong wind may die down. It is not uncommon to see clear, sunlit skies behind a tornado.
The following are facts about tornadoes:
The average forward speed of a tornado is 30 MPH, but may also vary from still to 70 MPH. Debris is picked up or a cloud forms in the funnel.
The average tornado moves from southwest to northeast, but tornadoes have been known to move in any direction. Tornadoes are most often reported east of the Rocky Mountains during spring and summer months.
Tornadoes can happen together with tropical storms and hurricanes as they move onto land. Waterspouts are tornadoes that form over water.
The tornado season in the southern states of America is March through May; in the northern states, it is late spring through early summer. Tornadoes are most likely to occur between 3 p.m. and 9 p.m., but can occur at any time.
（1）From the passage, where may tornadoes come from?
A.Hurricanes.
B.Great heat.
C.Thunderstorms.
D.Sandstorms.
（2）What does the underlined word “obscure” probably mean?
A.Hide.
B.Reduce.
C.Produce.
D.Raise.
（3）When a tornado happens, ________.
A.it often reaches the speed of 70 MPH
B.it can only be seen in the late of the day
C.it may form on the surface of sea water
D.it only moves from southwest to northeast
（4）The passage makes us believe that ________.
A.tornadoes are mostly seen in the southern states of America
B.warnings about tornadoes are well developed in many countries
C.of all the natural disasters, tornadoes often cause the biggest damage
D.tornadoes may strike so quickly that there is often little or no warning

阅读理解
Guide to four of the most exciting new adventure trips for 2017:
Sahara
Attractions: International Expeditions Length: 18 days Price: $13,998
Details: Remember the movie Ishtar? Now you, too, can spend days wandering in the desert, just like warren Beatty and Dustin Hoffman. Designed for rugged travelers, the camping expedition crosses1,500 miles of Niger's Sahara in four—wheel—drive vehicles.
Departure Time: May 12 Information: 800-633-4731; ietravel.com
Across Patagonia: From the Andes to the Ocean
Attractions: Boundless Journeys Length: 10 days Price: $8,995
Details: The newest route across Patagonia starts high in the Argentine Andes and follows the Futaleufu River into Chile all the way to the Pacific Ocean. Travelers start by trekking along the river, changing to rafts before taking up kayaks for the final leg.
Departure Time: March 5 Information: 800-941-8010; boundless, com.
Tribal(部落的)India
Attractions: Myths and Mountains Length: 17 days Price: $17,530
Details: For the travelers who have already visited the best-known India sites, this new trip visits a relatively unexplored state in central India ruled by the Vindhyachal Range and known for its wildlife, waterfalls, ancient sites and tribal culture.
Departure Time(出发时间): Feb 17 Information: 800-670-6984; myths.com
Dalmatian Coast Biking
Attractions: Backroads Length: 7 days Price: $7,298
Details: The company's first foray into Croatia follow scenic roadways across four islands between Dubrovnik and Spht.
Departure Time: May 7 Information: 800-462-2848; backroads.com
（1）What is the passage mainly about?
A.Suggestions on the adventure trips in America in 2017
B.The guide to several adventure trips around the world
C.The attractions in India
D.The prices of four adventure trips next year
（2）When does the trip across Patagoina start?
A.On Feb. 17
B.On March 5
C.On May 12
D.In January
（3）Which trip costs the least?
A.Tribal India
B.Crossing Patagonia
C.Sahara
D.Dalmation Coast Biking

阅读理解
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

The Gold Coast family holidays are always great fun whether you are from Australia or from abroad. There are beautiful beaches, adventure (冒险) parks, nature parks and so much more.
There are so many sights to see here. It is a pity to drive in a car and you'll miss a great part of it. Australia is home to many animals and birds that can only be seen when moving slowly and going into the areas where they live.
When you are on a bicycle, you have the advantage of being able to stop whenever you want to see an interesting animal or bird that you have never seen before. It is a quieter way of transportation as well, so you might even be able to take a picture. When you are on the beach, you can breathe that clean air and view the beauty of the water and sand. It is a totally different experience from passing it in a car.
There are many choices of hiring (租用) a bicycle to experience the Gold Coast. There are stores that will fit a bike perfectly to your size. These bikes for both adults and children are in many kinds and colors to please any taste. If you have ever wanted to try a tandem bike (双人单车), now is your chance, because they have those too.
A bicycle hire on Gold Coast is something that everyone should try at least once. This is a wonderful chance for anyone who likes to cycle and it is also a cheap way to travel with your family.
（1）You'd better not drive in a car on Gold Coast because ________.
A.you will break the traffic rules
B.you will cause much noise
C.you can't enjoy the beautiful sights well
D.you can't drive into some parks
（2）Which of the following is an advantage of hiring a bike according to Paragraph 3?
A.You can save much time.
B.You can reach the beach quickly.
C.You can get an animal for free.
D.You can stop whenever you want to see an interesting animal.
（3）What is Paragraph 4 mainly about?
A.How to hire bikes on Gold Coast.
B.What kinds of bikes there are in stores.
C.What bikes are the most popular.
D.Who can hire bikes on Gold Coast.
（4）What's the author's attitude towards a bike hire on Gold Coast?
A.He supports it very much.
B.He thinks it's a personal choice.
C.He doesn't like this way of traveling.
D.He thinks it's only good for adults.

阅读理解
There is no better way to enjoy Scottish traditions than going fishing and tasting a little whisky(威士忌) at a quiet place like the Inverlochy Castle. When Queen Victoria visited there in 1873 she wrote in her diary, “I never saw a lovelier spot,” And she didn't even go fishing.
Scotland is not easily defined. In certain moments, this quiet land of lakes and grass mountains changes before your very eyes. When evening gently sweeps the hillside into orange, the rivers, teeming with fish, can turn into streams of gold. As you settle down with just a people and a basket on the bank of River Orchy, near the Inverlochy Castle, any frustration will float away as gently as the circling water. It's just you and purple, pink, white flowers, a perfect harmony. If you are a new comer to fishing, learning the basics from a fishing guide may leave you with a lifetime's fun. For many, fishing is more than a sport; it is an art.
Scotland offers interesting place where you can rest after a long day's fishing. Set against a wild mountain and hidden behind woodland, the beautiful Inverlochy Castle Hotel below the Nevis is a perfect place to see the beauty of Scotland's mountains. Ben Nevis is the highest of mountains, and reaching its 1342-metre top is a challenge. But it's not just what goes up that matters; what comes down is unique. More than 900 metres high, on the mountain's north face, lies an all-important source of pure water. Its name comes from the Gaelic language "usqueb" or "water of life"; and it is the single most important ingredient(原料) in Scotland's best known whisky.
（1）The story of Queen Victoria is to show that       .
A.the queen is rich in tour experience
B.the Castle is a good place to go in Scotland
C.tasting whisky is better than going fishing
D.1873 is a special year for the queen
（2）How is Paragraph 2 mainly developed?
A.By giving descriptions.
B.By following time order.
C.By analyzing causes.
D.By making comparisons.
（3）What is Ben Nevis special for?
A.The Inverlochy Castle Hotel.
B.The beauty of its surroundings.
C.The water from the mountain.
D.The challenge up to its top.
（4）What is the main purpose of the passage?
A.To introduce Scottish traditions to tourists.
B.To show the attractions of Scotland to readers.
C.To explore geographical characteristics of Scotland.
D.To describe the pleasures of life in Scotland.

阅读理解
Energy goes from one plant or animal to another. A food chain shows how this energy moves. Each time an animal gets eaten, its energy is passed onto the animal that eats it. The food chain is very important because it keeps the balance of nature. If one part of the food chain disappears, it can affect all the other plants and animals. Any threat to the food chain is a threat to the environment's biodiversit(生物多样性). The food chain helps keep animal populations in balance. However, if something happens to increase or decrease one of the links in the food chain, that balance is broken. If one animal becomes endangered, it puts all the animals above it at risk.
Some of the threats are natural, such as wildfires, hurricanes, tornados, floods and so on. But the biggest threats to the food chain come from you and me. These threats include overhunting, overfishing, logging, farming, development, pollution, etc. The food chain is endangered anywhere humans have had an effect on the natural environment.
A recent study shows that the overfishing of large sharks is damaging the food chain along the US Atlantic coast. Canadian and American scientists say sharks are being killed in great numbers for their meat and fins(鳍). Now, not enough sharks are around to eat the cownose(牛鼻) ray. The ray's population has increased and they have eaten up the shellfish to the point where it has hurt commercial(商业的) fishing.
Many of us disturb the natural environment in our own backyards. It's up to us to take care of the environment and try not to disrupt the natural food chain. If we don't act responsibly, animals will start disappearing.
（1）What can we learn from Paragraph 1?
A.The food chain is not easy to be broken.
B.The energy of an animal usually disappears when it dies.
C.Increasing the links will not break the balance of nature.
D.Breaking the food chain is bad for the biodiversity of the environment.
（2）The study mentioned in Paragraph 3 proves that      .
A.human activities can be a big threat to the food chain
B.we are all responsible for the breaking of the food chain
C.natural disasters are hard to break the food chain
D.hunting large sharks for meat is beneficial
（3）We can infer that the writer wrote this passage mainly to      .
A.explain what the food chain is
B.tell us something interesting about Nature
C.suggest that we stop eating meat to save animals
D.suggest that we not disrupt the natural food chain

阅读理解
A Hobby is a regular activity that is done for enjoyment, typically during one's leisure（闲暇的） time. By continually taking part in a particular hobby, one can acquire practical skill and knowledge in that area. Is travel a good hobby? Travel, in the youngest sort, is a part of education and, in the elder, a part of experience. Some may think otherwise. To them, visiting churches, castles, libraries, etc. is an absolute wastage of time. They may further say that one can read the account of these or see the films of the important places of the world. They forget that touch of actuality gives a different type of sensation and satisfaction.
Travelling may be an expensive hobby but it makes up for the financial loss. If a traveller has interest in life and its manifestations（表现）, one can find much to keep oneself absorbed and happy. A student of any stream can definitely find something of his own interest and studies. One can definitely find everything that satisfies his cravings for knowledge and feelings.
As a hobby, travelling keeps us busy during leisure time; it is the best method to make use of time. Till a person breaks from dull routine, physically and mentally, one cannot find satisfaction. Travelling helps us to achieve this break. At a new place, one is curious to know and eager to gather all the unknown information about the place which he has neither read nor heard before and he gets thrills and surprises which keep the interest and enthusiasm alive and encourage us to keep our journey on.
While travelling, one comes across a number of people from varied backgrounds and places. By interacting with them, he comes to know about their traditions also. In case one has psychological bent of mind, one increases one's experience and power to understand others. Understanding human nature is, perhaps, the best part of education. Travelling satisfies all demands of a good hobby-it is absorbing education and refreshment to the mind, body and soul.
（1）What is the first paragraph mainly about?
A.Different views on travel.
B.The drawbacks of travel.
C.The importance of touching nature.
D.Differences between a hobby and travel.
（2）Which of the following can replace the underlined word “cravings” in the second paragraph?
A.changes.
B.researches.
C.desires.
D.problems.
（3）What can a person do to benefit himself both in his mind and body?
A.Travel about at his rush hours.
B.Take a break from daily routine by travelling.
C.Stay curious to know things around every day.
D.Interact with people from diverse cultures.
（4）What is the best title for the text?
A.Curiosity Killed the Cat
B.Travel Is a Good Hobby
C.Absorb Education & Refresh Yourself
D.Stay Hungry & Never Forget Your Ambition

阅读理解
阅读下列短文，从每题所给的四个选项 （A 、B 、C 和 D ）中，选出最佳选项。

A recent announcement by scientists that they have successfully cloned the first human embryo(胚胎) has caused much debate and has shocked many people around the world. On the one hand, some scientists point out that if you clone an embryo, you can produce valuable tissues(组织) and organs that could be used to save human lives. On the other hand, many people, including some scientists, disagree and fear that if mankind interferes with (干涉) nature in this way, they may be on their way to producing a real-life Frankenstein's monster.
Cloning is producing an exact copy of a plant or an animal using its cells. The first mammal to be cloned successfully from an adult cell was Dolly—the sheep. She was born in 1996 and died in early 2003, at a much younger age than normal. When she was born, many people were angry because they thought cloning would create more diseases in the animal world. However, in general the scientists were praised for their wonderful scientific breakthrough.
The Scottish scientist who created Dolly, Ian Wilmut, is shocked that some scientists are now considering cloning human beings. Although he researches cloning, he has never thought of creating copies of humans. Instead, he thinks the scientists should concentrate on creating new tissues and organs that could eventually be used to cure diseases like cancer. However, some people consider that cloning human embryos with the intention of destroying them shows no respect for human lives.
While cloning human embryos is illegal in many countries, some scientists are already pushing ahead with the research so as to deliver a cloned human baby. Severino Antinori, an Italian doctor, is one of the leaders in this field of research. He has declared that he wants to be the first to clone a human being.
In China, scientists have focused their efforts on cloning animals, as well as stem cells to be used in medical research. China has succeeded in producing clones of cows and goats, and continues to research ways in which cloning can benefit mankind.
（1）Which of the following statements about cloning is TRUE according to the passage?
A.Cloning technology can only be applied to animals.
B.A cloned animal can live longer than a normal one.
C.People all over the world are happy about the birth of Dolly.
D.Cloning can produce valuable tissues and organs to cure human diseases.
（2）The reasons why some people disagree with cloning include the following EXCEPT that       .
A.cloning may produce a real-life Frankenstein's monster
B.cloning might create more diseases in the animal world
C.cloning human embryos shows no respect for human lives
D.cloning can't help those who want to clone their dead children
（3）Who is in favor of cloning human beings?
A.Ian Wilmut.
B.Severino Antinori.
C.The author.
D.The Chinese scientists.

阅读理解
阅读下列短文，从每题所给的四个选项 （A 、B 、C 和 D ）中，选出最佳选项。
The National Gallery
Description：
The National Gallery is the British national art museum built on the north side of Trafalgar Square in London. It houses a diverse collection of more than 2,300 examples of European art ranging from 13th-century religious paintings to more modern ones by Renoir and Van Gogh. The older collections of the gallery are reached through the main entrance while the more modern works in the East Wing are most easily reached from Trafalgar Square by a ground floor entrance.
Layout：
The modern Sainsbury Wing on the western side of the building houses 13th- to 15th-century paintings, and artists include Duccio, Uccello, Van Eyck, Lippi, Mantegna, Botticelli and Memling．
The main West Wing houses 16th-century paintings, and artists include Leonardo da Vinci, Cranach, Michelangelo, Raphael, Bruegel, Bronzino, Titan and Veronese.
The North Wing houses 17th-century paintings, and artists include Caravaggio, Rubens, Poussin, Van Dyck, Velazquez, Claude and Vermeer．
The East Wing houses 18th- to early 20th-century paintings, and artists include Canaletto, Goya, Turner, Constable, Renoir and Van Gogh.
Opening Hours：
The Gallery is open every day from 10 am. to 6 pm. (Fridays 10 am. to 9 pm.) and is free, but charges apply to some special exhibitions.
Getting There：
Nearest underground stations: Charing Cross (2-minute walk), Leicester Square (3-minute walk), Embankment (7-minute walk), and Piccadilly Circus (8-minute walk).
（1）In which century's collection can you see religious paintings?
A.The 13th.
B.The 17th.
C.The 18th.
D.The 20th.   
（2）Where are Leonardo da Vinci's works shown?
A.In the East Wing.
B.In the main West Wing.
C.In the Sainsbury Wing
D.In the North Wing
（3）Which underground station is closest to the National Galley?
A.Piccadilly Circus.
B.Leicester Square.
C.Embankment.
D.Charing Cross.

阅读理解
Do you often lose things? Don't worry. Now a new tool that can be connected to any object you might lose may be the way to solve your problem. The Tile, a small square connected to your iPhone or iPad by means of Bluetooth, allows you to see how close you are to your missing item, within a 50-to-150-foot range (范围). If the item goes out of your phone's 150-foot range, it can still be found on other smart phones with the same app.
When you drive the app on your phone, it shows you, with green bars that increase or decrease, how close or far away you are from the Tile. You can also program it to make a sound when you get close to the Tile. And you can connect your phone with up to ten Tiles. And if your lost object—a dog, for example, or a stolen bike—go out of your own phone's 150-foot Bluetooth range, you can set it as a “lost item”. If any of the phones with the Tile app comes within range of your lost item, a message will be sent to your phone, telling you its position. The Tile app also has the ability to remember where it last saw your Tile, so that you can easily find where you left it.
Since the Tiles use Bluetooth rather than GPS, they are never out of battery or needn't to be charged, and they work for one year before needing to be replaced. And the app works with all generations of iPhones and iPads.
For further information, please visit www.tile666.com.
（1）What can the Tile app help you?
A.To find other phone users.
B.To find your missing items.
C.To save your phone's power.
D.To use your phone more wisely.
（2）Which of the following about the Tile is TRUE?
A.The Tile needs to be charged after a year of use.
B.One smart phone can only be linked up with one Tile.
C.The Tile app can send a message, but it can't make a sound.
D.The Tile cannot be connected with a phone without Bluetooth.
（3）What does the second paragraph mainly tell us?
A.What the Tile app is.
B.How the Tile app works.
C.Why the Tile app was created.
D.The advantages of the Tile app.
（4）Where does the passage probably come from?
A.A health report.
B.A personal diary.
C.An advertisement.
D.A tourism magazine.

阅读理解
阅读下列短文，从每题所给的四个选项 （A 、B 、C 和 D ）中，选出最佳选项。

The ancient city of Xi'an in China holds many treasures. And last month, archaeologists working there made an important discovery—a buried palace built in the third century B.C. to honor China's first emperor.
The entire palace measures roughly 2,260 feet long by 820 feet wide. It includes 10 courtyard houses and one main building. Archaeologists found bricks and pieces of pottery at the site of the palace, as well as the remains of walls and roads.
The palace is part of the massive burial complex of Emperor Qin Shihuangdi. He conquered seven warring kingdoms and united ancient China in 211 B.C.
Qin Shihuangdi wanted his legacy, or accomplishments, to be remembered forever. So he hired more than 700,000 workers to build his funeral complex in Xi'an. It represents a miniature version of his vast kingdom.
The complex also includes the world-famous terra-cotta army, a collection of more than 8,000 life-size clay statues. These sculptures represent soldiers, acrobats, and horses from the Qin Dynasty (221 B.C.-206 B.C.). Scientists have not yet found all these terra-cotta warriors, even though they discovered more of the statues last summer.
Farmers discovered the complex by accident in 1974. Since then, scientists studying the site have learned a great deal about life in ancient China. But much of the emperor's tomb has yet to be dug up, or unearthed. Many of the artifacts (objects from the past) are so old that scientists cannot preserve them.
"Archaeologists fully acknowledge that nobody in the world has the technology (to safely dig up Xi'an's treasures) yet," explains Kristin Romey, an expert on Chinese archaeology.
But as technology improves, archaeologists will keep digging to uncover the rest of the wonders that still lie buried in Xi'an.
"It's one of the most important archaeological discoveries that's waiting to be made," says Romey, "and we know where it is."
（1）How long is the history of the newly found palace?
A.About 820 years.
B.About 2,000 years.
C.About 2,200 years.
D.About 2,400 years.
（2）Why did Qin Shihuang have people build his tomb?
A.To keep all of his treasures in store.
B.To expect people to remember him forever.
C.To prevent his body from disappearing soon.
D.To collect more than 8,000 life-size clay soldiers.
（3）What causes trouble to dig out the emperor's tomb?
A.The local government doesn't support it.
B.Archaeologists are in great need.
C.There isn't plenty of money.
D.Technology isn't advanced yet.
（4）What might be the most suitable title for the passage?
A.An Ancient Palace is Uncovered
B.More Terra-cotta Warriors Are Found
C.Archeologists Are Waiting to Dig a Tomb
D.Technology Helps Discover the New Wonder