2. 外语
  3. The______nature of the virus allows it to continually change its form and thus go undetected by the body’s immune system.

The______nature of the virus allows it to continually change its form and thus go undetected by the body’s immune system.

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问题 The______nature of the virus allows it to continually change its form and thus go undetected by the body’s immune system.
选项
答案B，D
解析 allows说明前后同义重复。空格与continually change its form(连续变换形态)同义重复。infectious传染性的，mutable易变的，debilitating使人衰弱的，protean易变的，benign仁慈的，contagious传染性的。答案选BD。注：这里infectious和contagious是干扰项，同表示“传染性的”。
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