题型：单选题题类：常考题难易度：普通

冀教版初中英语八年级下册Unit 7 Lesson 38 The world is a big place!同步练习

There were ________ of people in the world in 2010.

A、billion B、billions C、seven billion D、seven billions

举一反三

—I want two {#blank#}1{#/blank#}(dozens/ dozen) apples.

Ten are black and twenty are red.

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