If we do not deal with ________ problem caused by air pollution, our planet may

题干

If we do not deal with ________ problem caused by air pollution, our planet may no longer be ________ healthy place for us.

A．a; the	B．a; a
C．the; a	D．the; the

上一题下一题 0.64难度单项选择更新时间:2014-04-18 09:23:04

小学学科试题库

初中学科试题库

高中学科试题库