Warmer seas also lead to melting from below of polar ice shelves.Scientists also worry that warmer water could interrupt the socalled ocean conveyor belt,the system of global currents that is largely responsible for regulating Earth’s temperature.Its collapse could trigger catastrophically(灾难性地) rapid climate changes.
The only way to lower ocean temperatures is to dramatically control our emission of greenhouse gases.However,even if we immediately dropped carbon dioxide emissions to zero,the gases we’ve already released would take decades or longer to disappear.
1.This passage is mainly about
.
A.sea species
B.a rise in sea temperature
C.changes in the sea
D.humans’ effect on the sea
答案 B
解析 主旨大意题。通读全文可知,本文主要介绍了海洋温度升高所带来的不良后果,故选B。
2.What will happen to penguins and seals if krill is killed in large numbers?
A.They will die out at once.
B.They will leave the sea.
C.They will be lacking in food.
D.They will turn to other fish for food.
答案 C
解析 细节理解题。由第二段最后一句可知,企鹅和海豹都吃磷虾,因此磷虾数量减少必然会使它们的食物减少,故选C。
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