Warm­blooded animals weren't immune from the size change caused by climate change. Many birds are now smaller. Mammals have been miniaturized too. Soay sheep are thinner. Red deer are weaker. And polar bears are smaller, compared with historical records.

　　This is not the first time this has happened in Earth's history. 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.

　　文章大意：本文是一篇科普说明文。主要报道了一项新发现，研究人员发现了气候变暖会导致地球上许多生物个体变小的现象。

　　5．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

　　答案：D　标题概括题。通读全文及第二段首句“45 percent of the species studied now reach smaller adult sizes than they did in the past.”可知，本文主要讲述了气候变暖会导致许多生物个体变小的现象，故D项正确。

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