单项选择题

It is very difficult to weigh ____ this economy without preparation.

A. down
B. in
C. out
D. up
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I've made a few minor adjustments to the seating plan.
A. arrangements
B. appointments
C. changes
D. reforms
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If an innovation(创新) does not _____ leadership from the beginning, it is unlikely to be innovative(创新的) enough.
A. objective to
B. object to
C. aim to
D. aim at
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