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题型：单选题 题类：常考题 难易度：容易
人教版（新起点）小学英语三年级上册Unit 1同步练习A
Without water, {#blank#}1{#/blank#} {#blank#}2{#/blank#}no life on the earth.
{#blank#}1{#/blank#} are the{#blank#}2{#/blank#} CDs?
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