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

试题分析：句意：污染是个严重问题。科学家们想办法来解决她。A 想出来；B 加油；C 出版；D 走近；结合语境故选A。