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题型：单选题题类：常考题难易度：普通

Air pollution, together with littering, ____ many problems in our large industrial cities today.

A、causes B、cause C、caused D、causing

举一反三

It was the boy, rather than his teachers, that for what the boy had done.

Generally, students' inner motivation with high expectations from others ______ essential to their development.

What {#blank#}1{#/blank#}(标准) are used for assessing a student's ability?

All we need ________ a small piece of land where we can plant various kinds of fruit trees throughout the growing seasons of the year.

As is reported in the newspaper, the number of people who ______ hungry ______ greatly reduced.

A good student is one who f{#blank#}1{#/blank#} on his studies, making full use of his time to learn both in and out of class.

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