_____ 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 考查形容词辨析。abnormal与normal相对,表示“反常的”,符合题目的语义及用法要求。deliberate表示“深思熟虑的,故意的”;consistent指“一致的,相容的”;primitive指“原始的,简单的”。
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