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Many of us have concerns about the chall...

Many of us have concerns about the challenges facing future generations as our global population _______ and the earth’s natural resources decrease.

A. extends    B. declines

C. swells    D. varies

 

C 【解析】 考查动词词义辨析。A. extends扩大;B. declines下降;C. swells膨胀;D. varies改变。句意:随着全球人口的膨胀和自然资源的减少,我们许多人都对后代面临的挑战感到担忧。根据“the earth’s natural resources decrease”判断此处表示“人口的膨胀”,故C项正确。  
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