A. the researchers 

　　B. the grasses

　　C. the bison        

　　 D. the protein

　　3.What is the main reason for the bison to become smaller?

　　A. The deceasing amount of grass.

　　B. The rising temperature.

　　C. The rising number of bison.

　　D. The loss of weight.

　　4.Paragraph 5 is written as an example to show ________.

　　A. Craine’s prediction will come true in 50 years

　　B. bison are smaller than in the past

　　C. the nature balance is being destroyed

　　D. bison’s size is linked with different climate

　　参考答案1—4、ACBD

　　阅读下列短文，从每题所给的A.B.C和D项中，选出最佳选项。

　　Although April did not bring us the rains we all hoped for, and although the Central Valley doesn’t generally experience the sound and lightning that can go with those rains, it’s still important for parents to be able to answer the youthful questions about thunder and lightning.

　　The reason these two wonders of nature are so difficult for many adults to explain to children is that they are not very well understood by adults themselves. For example, did you know that the lightning we see flashing down to the earth from a cloud is actually flashing up to a cloud from the earth? Our eyes trick us into thinking we see a downward motion when it’s actually the other way around. But then, if we believed only what we think and we see, we’d still insist that the sun rises in the morning and sets at night.

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