The cells contribute to immune defenses in two major ways: some direct and________immune responses whereas others directly attac

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问题 The cells contribute to immune defenses in two major ways: some direct and________immune responses whereas others directly attack infected or cancerous cells.

选项 A、regulate
B、activate
C、retain
D、consolidate

答案A

解析 regulate “调节,控制,管理”; activate“使活动,使开始作用,启动”;retain“保持”;consolidate“合并,巩固,加强”。根据医学常识,有的细胞是通过“调节”免疫反应来促进免疫防御的,因此填入空格的词语需要含有“调节”之意。故选A。
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