3．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。

　　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.

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