2. 外语
  3. ______ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.

______ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.

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问题 ______ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.
选项 A、Deliberate
B、Consistent
C、Primitive
D、Abnormal
答案D
解析 根据题干可判断，填空处应与upset the delicate chemical balance“破坏微妙的化学平衡”形成语义场共现。D Abnormal意为“反常的，异常的”，与破坏化学平衡有关联，即大脑中的化学平衡被破坏会导致反常的行为，符合题意，故为答案。A Deliberate“故意的”、B Consistent“持续的”、C Primitive“原始的”均与句意不符。
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