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【題目】We believe scientists will________a way to solve the air pollution．

A．set off

B．put off

C．come up with

D．catch up with

【答案】C

【解析】句意：我們相信科學家們會想出一個辦法來解決空氣污染的。set off意為“動身，出發(fā)”；put off意為“推遲，拖延”；come up with意為“想出，提出”；catch up with意為“趕上”。

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