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题型：单选题题类：常考题难易度：普通

概数（hundred sthousands of）与确数

Suddenly _______ birds flew out of the trees.

A、thousands B、thousand of C、thousands of D、thousand

举一反三

There are three books in the bookstore.（）

More than nine_____students are doing sports now.

There are over_____students in their school.

There are________ stars in the sky, but some of them are too far to be seen.

________ birds are our good friends.

— Are blue whales {#blank#}1{#/blank#} danger?

— Yes. There are only about ten {#blank#}2{#/blank#} in the wild.

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