选择知识点

Recycling plastic has always been a stop-start effort,and the wide variety of plastics we produce,the pollution from waste,and other limitations make recycling an economic（经济）problem.It's estimated（估计）only 9% of plastic ever created has been recycled.But with the help of a chemical process,Canadian Miranda Wang and her company BioCellection want to change that.
Stability is one of plastic greatest qualities and downside.There's limited evidence that some plastics can biodegrade（生物降解）but largely photo-plastics degrade in the sun.It's a long process,and the truth is that we can only estimate how long it takes.Wang is looking to break the inaction and BioCellection's task is to make most plastic waste recyclable.
She outlines two current methods.One is to take plastics like water bottles,wash them,cut them,melt and reconstitute them. "That's a very limited process." she says,due to the requirement that plastics be "clean".The other,which can handle dirtier plastics and a level of pollution,is called hydrolysis（热解）.Intense heat is applied to break down plastics so they can be reused as oils for energy,but "it's not economical," she says.
BioCellection's solution builds on research from over ten years ago,Wang explains,when a US study discovered pure polyethylene powder（聚乙烯粉）could be broken down by a catalyst（催化剂）.Wang and her co-founder Jean hit upon a bacterium being able to eat plastic.In the years since,they engineered a comparable catalyst capable of doing the same job,only faster,which even works on plastics no one else can recycle at present. "We have now found a catalyst that is much cheaper than the one that was used before," Wang says.
Currently focusing on plastic films like shopping bags,the three-hour process breaks down plastic into chemicals that can act as the building blocks for more complex plastic products.
"Right now we're able to achieve about 70% transformation from plastic waste material to these chemicals," she adds,saying they're working to increase that figure.



Why has so little plastic been recycled？ ______

A. Plastic is chemically stable.
B. Recycling plastic led to pollution.
C. We produced various plastics.
D. Most photo-plastics degrade in the sun.

What does Wang think of the two current methods？ ______

A. Highly effective and dynamic.
B. Expensive and pollution-causing.
C. Limited and energy-consuming.
D. Widely used and recognized.

What did BioCellection find effective to recycle plastics？ ______

A. Polyethylene powder.
B. Chemical products.
C. Plastic films.
D. A catalyst.

What is the text mainly about？ ______

A. Miranda Wang and her company.
B. A new plastic recycling method.
C. The greatest downside of plastic.
D. Transformation of plastic waste.

For centuries,tea has been used for far more than overcoming thirst.Around the world people drink it to relax and restore energy.
Green,oolong and black tea come from the same plant — Camellia sinensis（茶树）.Green tea,however,is processed in a different way,which results in higher levels of some of the compounds that scientists believe have positive effects on our mental health.
A 2017 review of more than 100 studies found that green tea can impact the brain in three ways：reduce anxiety；focus attention；and improve brain function,especially memory.However,it was cautioned that the effects aren't large,and current evidence is mainly provided by small-scale studies.
There are also suggestions that tea could improve the symptoms of depression,dementia（痴呆）and Down syndrome （唐氏综合征）.
A 2018 study conducted in South Korea found that frequent green tea drinkers were 21% less likely to develop depression than those who were non-drinkers.However,as an observational study,it couldn't establish cause and effect,only association.
Tea also has some benefits for our physical health — it's linked to a longer life,could reduce some risk factors for cardiovascular（心血管的） disease such as heart attack and stroke,and may also have a weight-losing effect.
"We need better data to truly assess the benefits of tea on our mental and physical well-being," said Gunter Kuhnle at the University of Reading,"however,with the exception of green tea pills,which have been linked to liver damage,and burning tea,which has been linked to esophageal（食道的）cancer,there's no real downside to a cup of tea.I think most people enjoy rituals（仪式感）.It's a comforting thing.If there's anything wrong,here it's a cup of tea that's needed."



How is green tea different from oolong and black tea？ ______

A. It cures depression and dementia.
B. It is never part of a complex ritual.
C. It has higher levels of certain compounds.
D. It is taken from Camellia sinensis.

What does Gunter Kuhnle want to express？ ______

A. Green tea rituals give people comfort.
B. Green tea pills may cause esophageal cancer.
C. Green tea brings people more harm than good.
D. Green tea proves beneficial with no exception.

Which can be a suitable title for the text？ ______

A. Which tea prevents cancer
B. Why drinking tea might help
C. When tea causes liver damage
D. How teas are processed

Perhaps no other scientist _________ a greater impact on China's aerospace science than Qian Xuesen.（　　）

_______ to a new culture can be difficult.However,you need to step out of your comfort zone.（　　）

He is a man whose actions do not _____ his promises.（　　）

At a minimum,the kinds of food local people _____ tell us what they grow in their region,what kinds of lives they lead,and what they like and do not like.（　　）

______，hungry,and not knowing a word of Chinese,we had no idea how to order,so the chef just began filling our table with the best food we ________.（　　）

It is also better to eat a _____ amount of food each time ______ to eat a lot in one meal,and then a little in the next.（　　）

_______ coming to China,my only experience with Chinese cooking was in America,with Chinese food that ________ to suit American tastes.（　　）

Chinese audiences on average spent more time watching entertainment content online in this uncommon year when the battle against COVID-19 is still being fought.
An average consumer has spent 133.9 minutes each day watching TV dramas, a 10 percent increase compared to last year, according to the report. Interestingly, TV romantic dramas make up 36 percent of all 131 new television series this year, ranking the first.
In the overseas market, Chinese dramas are seeing a rise in popularity, such as hit costume dramas Three Lives Three Worlds, The Pillow Book, and The Romance of Tiger and Rose. The report shows that subscribers（订阅者）of WeTV， the overseas version of Tencent Video in more than 110 countries and regions, have risen 175 percent over last year, with time spent watching these programs up 300 percent year-on-year.
Shows with strong female roles are more popular, like the hit series Nothing but Thirty,I Will Find You a Better Home and A Murderous Affair in Horizon Tower,the report said. It also found that a quality trailer（预告片）played an important role in drawing an audience,as about 90 percent of consumers pick their choices from trailers.
As a result of the six-month shutting down of Chinese cinemas, a number of people have chosen watching films online.
Through Nov. 30， a total of 15 online films have earned more than 10 million yuan, propelling the annual box office income on Tencent Video to nearly 500 million yuan this year. While TV series are almost "dominated" by female audiences, men are favored online movies more. Nearly 70 percent of online film viewers are men, whose favorite themes center on fantasy, comedy and adventure.



The shows with strong female roles are mentioned except ______ .

A. Nothing but Thirty.
B. I Will Find Your a Better Home.
C. The Romance of Tiger and Rose.
D. A Murderous Affair in Horizon Tower.

The underlined word "propelling" in the last paragraph probably means ______ .

A. protecting
B. pushing
C. stopping
D. beating

Which of the following is NOT true according to the passage？ ______

A. Chinese audiences spent more time online due to the COVID-19
B. Chinese dramas have made success in the overseas market
C. A quality trailer plays an important role in consumers' choices
D. Compared with males, females have a more preference for online film