【題目】There is no doubt that by recycling textbooks, the cost of books will be __________ greatly.

A. increased

B. gathered

C. collected

D. reduced

【答案】D

【解析】reduce“減少，降低”；mcrease“增加”；gather“聚集”；collect“收集”。根據(jù)句意“毫無疑問，通過課本循環(huán)利用，在書上的花費(fèi)會大大降低”可知答案為D。

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