Total research and development expenditure for the area of waste _______has steadily increased for the past 3 years.

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问题 Total research and development expenditure for the area of waste _______has steadily increased for the past 3 years.

选项 A、construction
B、currency
C、abundance
D、disposal

答案D

解析 这里已经有名词waste,再加一个名词就变成复合名词。复合名词(N1+N2)经常可以解释为“N2是N1的动词,N1是N2的宾语”。要把废物怎么样呢?处理掉对不对?waste disposal意为“废物处理”。
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