单项选择题

Making energy use completely harmless to the environment（）very difficult and usually economically expensive.

A.are
B.is
C.have been
D.shall be

<上一题 目录 下一题>
热门 试题

单项选择题
The thief was so （）by teh bright lights and barking dogs that he left hastily.

A.frightened
B.annoyed
C.puzzled
D.disappointed
单项选择题
I cannot（）your plan,for I see no money return for the pursuit.

A.argue with
B.approve of
C.rurn down
D.give up
相关试题