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课时提升作业(四十)
Ⅰ. 单项填空
1. (2013·天津模拟)After several rounds of competition, the little girl ____ because of her excellent spoken English and quick response.
A. put out B. picked out C. broke out D. stood out
2. For years, scientists have been worried about the _____ of air pollution on the Earth’s natural conditions.
A. effect B. result C. account D. cause
3. Nowadays a large number of college students home and abroad ____ some part-time jobs in their spare time.
A. is doing B. does C. do D. did
4. More and more countries are making great efforts to ______ space.
A. investigate B. explore C. pretend D. found
5. More and more attention has been drawn to the fact that many children are ____ in the countryside when their parents flood into the cities for jobs.
A. left off B. left aside C. left out D. left behind
6. The plan is difficult ____ in practice though it sounds good in theory.
