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”形成照应。[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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