單項(xiàng)選擇題Human behavior is mostly a product of learning()the behavior of animals depends mainly on instinct.

A.so
B.unless
C.if
D.while


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2.單項(xiàng)選擇題()the've got to know each other a little better, they get along just fine.

A.Due to
B.Ever since
C.Now that
D.Regardless of

3.單項(xiàng)選擇題(),John has been to several foreign countries.

A.Even he is young
B.Young though he is
C.In spite of he is young
D.Young is as he

4.單項(xiàng)選擇題()the concert had begun did we realize what a splendid show it was going to be.

A.No sooner
B.Only after
C.Hardly
D.Scarcely