单项选择题

As a biologist and ecologist, he is （） all forms of hunting.

A. against
B. down
C. back
D. off

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I became a teacher because I preferred books and people （） politics.

A. than
B. to
C. rather
D. against
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We have produced twice as much steel this year （） 4 years ago.

A. than we did
B. as we did
C. than we have produced
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