Scientists have discovered a close_____between smoking and several serious diseases.

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问题 Scientists have discovered a close_____between smoking and several serious diseases.

选项 A、action
B、connection
C、union
D、function

答案B

解析 各项的意思是:action“行动,活动;情节”;connection“联系”;union“联盟,联合;协会”;function“功能;职责”。根据句意判断,答案为B。
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