2. 外语
  3. Cornwall Research Facility in Salem primarily focuses on lung cancer research______treatment.

Cornwall Research Facility in Salem primarily focuses on lung cancer research______treatment.

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问题 Cornwall Research Facility in Salem primarily focuses on lung cancer research______treatment.
选项 A、so
B、nor
C、but
D、and
答案D
解析 根据上下文可知在横线上应该填入一个可以连接research和treatment的连词。查看四个选项可知选项(D)的and作为并列关系的连词是正确的答案。
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