C.too many studies on animals' size have been done
D.people can avoid the negative effects of climate change
答案:A 细节理解题。文章第三段研究人员提到“We do not yet know the mechanisms involved”,其中the mechanisms指的是气候变暖影响了生物个体大小的机制,故A项正确。
4.What can we learn from the passage?
A.Climate change has even affected plankton negatively.
B.Birds have suffered more from climate change than fish.
C.Ants, bees and spiders have been shrinking by 50% to 70% in the past decade.
D.A warming event causing species to become smaller has never happened before.
答案:A 细节理解题。根据第四段最后一句“There is a recent report on warmer temperatures' negative effects on plankton, the base of the marine ecosystem.”可知,气候变化已经对浮游生物产生了有害影响。故A项正确。
5.What's the author's attitude toward climate change in the passage?
A.Concerned.
B.Optimistic.
C.Indifferent.
D.Confident.
答案:A 观点态度题。根据文章最后一句“So, it is likely that more negative influences of climate change will be shown in future.”可知,作者对气候变暖对生物的影响有些担忧。故A项Concerned(关心的)符合语境。
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