Question

Pollution is a serious problem. Scientists have _____ some good ways to save it.

A．come up with

B．come on

C．come out

D．come up

Answer 1

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。