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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