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题型：单选题题类：模拟题难易度：普通

The number of the workers here ___ 200. Half of them ____under 30 years old.

A、are, are B、is, are C、are, is D、 is, is

举一反三

In our school library there a number of books on science and the number of them growing larger and larger.

________of the students in our class________ going to the summer camp in Beijing next week.

In the last few years, thousands of films _______ all over the world.

最后，水变成了冰。

Finally, the water{#blank#}1{#/blank#} {#blank#}2{#/blank#}ice.

Many children in Britain {#blank#}1{#/blank#} (allow) to have their own bank cards these days.

All the club members _______ the floor when they heard someone _______ for help.

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