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6. The        economic changes of the past few years have brought new difficulties threatening the effectiveness of national AIDS control programs.

   A. wealthy   B. novel

   C. obvious   D. fundamental

6. D fundamental意为"根本的,基础的", fundamental economic changes意为"基本的经济改革"。 novel用作形容词时意为"新鲜的,鲜活的"。

题目来源:高考英语组合训练多项选择+完成句子 > 组合训练19-20

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