课时作业(二十二) [必修4 Module 4 Great Scientists]
[限时:35分钟]
Ⅰ.单项填空
1.________ in the mountains for a week,
the two students were finally saved by the local police. A.Having lost
B.Lost
C.Being lost
D.Losing
2.There is something we need to________before the meeting begins.
A.clear up
B.clear away
C.clean up
D.clean out
3.After numerous experiments,
some doctors have made a ________ in the treatment of cancer.
A.breakdown
B.breakup
C.breakthrough
D.breakout
4. His sister left home in 1998,
and ________ since.
A.had not been heard of
B.has not been heard of
C.had not heard of
D.has not heard of5.The key
________ the problem of traffic jams is to pay the “congestion charge” ________ by the mayor of London.
A.to solving; introducing
B.to solve; introducing
C.to solving; introduced
D.to solve;
introduced
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