______human behavior may be caused by eating substances that upset the delicate

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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

解析形容词词义辨析。根据句中提供的caused by，upset，delicate提供的语境，空格应填入表示贬义的形容词。选项中，只有abnormal(反常的)符合句意。故答案为D。

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