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

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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