Finding fish is going to get harder as climate change continues to heat the world's oceans.A new study finds that warming seas over the past 80 years have reduced the sustainable catch of 124 species of fish and shellfish.Sustainable catch refers to the amount that can be harvested without doing long-term damage to the health of populations of some species.
  Overfishing has made that decline worse,researchers say.Overfishing refers to catching so many fish that the size of the population falls.In some parts of the world,such as the heavily fished Sea of Japan,the decrease is as high as 35 percent.That's a loss of more than one in every three fish.
  Researchers examined changes in 235 populations of fish and shell fish between 1930 and 2010．Those fish populations spread far apart across 38 ocean regions.Temperature changes vary from one ocean site to another.But on average over that time.Earth's sea-surface temperatures have risen by about half a degree Celsius.
  On average,that warming has caused the sustainable catch to drop by 4.1 percent,the study found.About 8 percent of the fish and shellfish populations the team studied saw losses as a result of the ocean warming.However,about 4 percent of some populations increased.That's because certain species have thrived in warmer waters.One example is a kind of black sea fish.It lives along the northeastern U．S．coast.As warming continues,these fish will reproduce faster until they reach their limit.
  About 3.2 billion people worldwide rely on seafood as a source of food.That means it's urgent for commercial fishing fleets and regulators to consider how climate change is affecting the health of all of those fish in the sea.



What does the new study discover？ ______

A. Overfishing is to blame for fish health.
B. Warming seas cause fewer fish and shellfish.
C. Seafood matters to people's health worldwide.
D. The living regions of fish and shellfish are different.

What does the underlined word "thrived" in Paragraph 4 probably mean？ ______

A. Survived narrowly.
B. Disappeared soon.
C. Decreased sharply.
D. Developed quickly.

What do we know about species of fish and shellfish？ ______

A. About 8 percent of them suffered from a great loss.
B. About 35 percent of them survived in the Sea of Japan.
C. About 3.2 billion species have been saved up to now.
D. About 80 species have died out because of warming seas.

From which is the text probably taken？ ______

A. A cooking guide.
B. A science magazine.
C. A news review.
D. A health brochure.