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题型：单选题 题类：常考题 难易度：普通
新目标英语九年级（全）Unit 13 We’re trying to save the earth! （Section B）
When summer comes, it gets {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}.
—Yes, but we have taken some measures to stop it. Look! the sky is ____ bluer than before.
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