Cotton production has been ________ the decline these years.A、downB、onC、atD、u

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问题 Cotton production has been ________ the decline these years.

选项 A、down
B、on
C、at
D、under

答案 B

解析 介词的固定搭配。on the decline为固定搭配,意为“在减少,在衰退”,如:The population of that country is on the decline.(那个国家的人口在减少)故只能选B。句意为:这些年来,棉花的产量在减少。
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