________ human behavior may be caused by eating substances that upset the delica

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问题 ________ human behavior may be caused by eating substances that upset the delicate chenfical balance in the brain.

选项 A、Deliberate
B、Consistent
C、Primitive
D、Abnormal

答案 D

解析 A. Deliberate故意的；B．Consistent持续的；C. Primitive原始的；D．Abnormal反常的，异常的，变态的。根据句意，应选D。句意为：人类的反常行为可能是由于吃了某种东西，这种东西扰乱了人脑内的复杂的化学平衡。

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