Unit 13 We are trying to save the earth!
综合能力演练
I.单项选择。
1．— How much do I need to pay _______ the dictionary?
— About fifty yuan．
A．on B．for C．with D．of
2．We must do something useful to _______ pollution.
A. cut off B. cut up C. cut down D. cut in
3．Smoking can _____ lung cancer. You’d better give it up.
A. work on B. lead to C. take away D. put out
4．—There are only a few old city walls left．
—Yeah．Most of them _______ in the 1960s．
A．pulled down B．have pulled down C．had pulled down D. were pulled down
5．—What are the _______ of bike riding?
— It can help cut down air pollution.
A. advantages B. reasons C. results D. ideas
