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题型：单选题题类：常考题难易度：普通

数词—— 表示“几十”的复数形式

_______ is fifteen.

A、Three fives B、Threes five C、Threes fives D、Three five

举一反三

______people will come to the concert.

It's said that _______ people flew to Paris during the Easter week.

Did you know that the Earth is home to ________ animals?

There are{#blank#}1{#/blank#}(million)of living things on the Earth.

Tim likes collecting coins, and he's got ______________ them.

{#blank#}1{#/blank#}(成千上万的) volunteers took part in the event.

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