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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

More than one ________ the people heart and soul.

My pen {#blank#}1{#/blank#}(write) smoothly and it doesn't need to be repaired.

More than one boy of your members ______ to act in the short play, which is ______ tomorrow.

It is reported that many a new house {#blank#}1{#/blank#} (build) at present in the disaster area.

The teacher together with his assistants _____ ten cell samples during the past two months in the school lab.

Nowadays, cycling, along with jogging and swimming, ____ as one of the best all-round forms of exercise.

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