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 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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