B.had strong influences than
C.been weakened by
D.been less than
答案:B 词义猜测题。根据本句中的but可知,画线词与其前面的内容“大气中二氧化碳的增加会使植物个体变大”是转折关系,并根据下文中气温、湿度、可利用的营养等条件对生物的影响可知,这些条件的改变似乎比二氧化碳浓度增加更有影响力。故B项正确。
18.Researchers from the National University of Singapore believe that ________.
A.how climate change effects animals' size has not been found clearly
B.all the animals on the earth have become smaller
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。
19.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.
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