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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 4 Lesson 23 The Internet—Good or Bad 同步练习
If everyone {#blank#}1{#/blank#} the environment，the world will become more and more beautiful.
Eight planets{#blank#}1{#/blank#} {#blank#}2{#/blank#}the sun, and the earth is one of them.
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