2. 外语
  3. ______ research is being done into the connection between the disease and poor living conditions.

______ research is being done into the connection between the disease and poor living conditions.

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问题 ______ research is being done into the connection between the disease and poor living conditions.
选项 A、Intensive
B、Expansive
C、Expensive
D、Extensive
答案D
解析 语义连贯题。研究是[D]Extensive“大量的，广泛的”，指数量很多或范围很广。[A]Intensive“强烈的，精深的”；[B]Expansive“易膨胀的，易扩张的，广阔的”，指体积或面积等变的更大；[C]Expansive“昂贵的”。
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大学英语四级

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