题目内容

Human behavior is mostly a product of learning, ______ the behavior of animal depends mainly on instinct.

A. whereas
B. so
C. unless
D. that

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the Europeans knew what compass was, the Chinese had put it into practical use.

A. Before long
B. Long since
C. Long ago
D. Long before

She thought I was talking about her daughter, ______ in fact I was talking about my daughter.

A. because
B. unless
C. while
D. therefore

He hasn’t yet arrived. He may, ______, come later.

A. but
B. if
C. or
D. however

the students the teacher knows anything about it.

A. Neither, nor
B. Either, or
C. Both, and
D. Not only, but also