A．track　B．access

　　C．means

　　D．passage

　　反馈2.2（2017上海闵行期末，25）Most of the people in this village have free access ______ clean drinking water.

　　A．with　 B．for

　　C．byD．to

　　3．concentrate...on...集中（注意力、思想等）；专心致志于

　　concentrate...on...中concentrate的宾语常常为efforts，attention，energy等。

　　The scientist concentrates his energies on his research.

　　这位科学家把精力专注于自己的研究。

　　用法拓展concentrated adj.全力以赴的；浓缩的；密集的

　　concentration n.专心；专注；集中；浓度

　　The engineer has made a concentrated effort to improve his work.

　　这位工程师全力以赴改进自己的工作。

　　I was so tired that I lost my concentration and nearly drove into a bridge.

　　我这么疲劳以至于走神了，驾车几乎撞上了一座桥。

　　反馈3.1 Ann couldn't concentrate ______ what she was doing while her family were watching TV.

　　A．to

　　B．on

　　C．for

　　D．in

　　反馈3.2Having failed my history and geography exams，I decided to ______ science subjects.

　　A．apply for

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