Pollution is a serious problem. Scientists have _____ some good ways to save it.
A．come up withB．come onC．come outD．come up
A

試題分析：句意：污染是個嚴(yán)重問題。科學(xué)家們想辦法來解決她。A 想出來；B 加油；C 出版；D 走近；結(jié)合語境故選A。
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