Craine said the results of climate change in coming decades can already be seen by comparing bison in cooler, wetter places with those in warmer, drier places. For example, the average 7-year-old male bison in South Dakota weighed 1, 900 pounds, while an average 7- year-old male bison in Oklahoma — a warmer place — weighed 1, 300 pounds.

　　“The difference in temperature between those two states is around 20 degrees Fahrenheit, which is about three times the projected increase in temperatures over the next 75 years,” Craine said. “It is a clear indicator that long-term warming will affect bison and is something that will happen across the U.S. over the next 50-75 years.”

　　1..In the next fifty years, researchers Say, bison will ________.

　　A. become smaller and lighter

　　B. disappear in the Great Plains

　　C. play a less important part

　　D. adapt to different climate changes

　　2.The underlined word “grazers” probably refers to ________.

　　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.

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