55 million years ago, a warming event similar to the current climate change caused bees, spiders and ants to shrink by 50 to 75 percent over several thousand years. That event happened over a long time than the current climate change.

　　The speed of modern climate change could mean organisms may not respond or adapt quickly enough, especially those with long generation times. So, it is likely that more negative influences of climate change will be shown in future.

　　28．Which of the following would be the best title for the passage?

　　A. Why do some species become smaller?

　　B. How does temperature change in Earth's history?

　　C. Climate change has many negative effects

　　D. Species become smaller as climate warms

　　29．The underlined word “trumped” in the first paragraph can be replaced by ________.

　　A. beaten

　　B. increased

　　C. strengthened

　　D. equaled

　　30．Researchers from the National University of Singapore believe that ________.

　　A. too many studies on animals' size have been done

　　B. all the animals on the earth have become smaller

　　C. how climate change affects animals' size has not been found clearly

　　D. climate change has more negative effects on warm­blooded animals

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