Our earth is getting warmer and warmer. It is time for us to_____ the emission(排放) of CO2.

A. break down B. cut in C. cut down D. cut off

 

C

【解析】

試題分析：考查短語辨析。A. break down拋錨；B. cut in插嘴；C. cut down消減；D. cut off切斷。句意：我們的地球變得越來越暖，是該我們消減二氧化碳排放的時候了。故C正確。

考點：考查短語辨析

 

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