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题型：单选题 题类：常考题 难易度：困难
外研版（三年级起点）小学英语六年级下册module7 unit 1 he spent about twenty-one hours in space同步测试（一）
—_______.
The pests {#blank#}1{#/blank#} {#blank#}2{#/blank#}, but the ladybirds do not.
—That's a good idea.
—______, it isn't.
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