单项选择题

______ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.

A. Deliberate
B. Consistent
C. Primitive
D. Abnormal
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Although I liked the appearance of the house, what really made me decide to buy it was the beautiful ______ through the window.
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After ______ seemed an endless wait, it was her turn to enter the personnel manager's office.
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