2. 职称英语
  3. (Cigarette smock) has been shown to contain numerous compounds that (are known t

(Cigarette smock) has been shown to contain numerous compounds that (are known t

游客2025-05-10  40
问题 (Cigarette smock) has been shown to contain numerous compounds that (are known to) cause cancer in experimental animals and (they) appear, to be strongly (linked to) human cancer, especially cancer of the lung.
选项 A、Cigarette smock
B、are known to
C、they
D、linked
答案 C改为it
解析 指代前面的单数名词cigarette smoke。
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