2. 医学
  3. For years an acrimonious debate over how to protect heroin users impeded efforts in the U. S.A. to control the spread of AIDS.

For years an acrimonious debate over how to protect heroin users impeded efforts in the U. S.A. to control the spread of AIDS.

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问题 For years an acrimonious debate over how to protect heroin users impeded efforts in the U. S.A. to control the spread of AIDS.
选项 A、encumbered
B、belied
C、convoluted
D、stoked
答案A
解析 句意：多年来，一场关于如何保护海洛因使用者的激烈讨论阻碍着美国在控制艾滋病的传播方面的努力。impede阻碍，妨碍。encumber阻碍。belie给人以假象。convolute旋绕。stoke添燃料。
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