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牛津版（深圳•广州）2017-2018学年初中英语七年级下册Module 2 Man's best friends Unit 4 Save the trees. 综合复习
—That's true. It has become one of the biggest killers of men.
They have planted{#blank#}1{#/blank#} {#blank#}2{#/blank#}trees on the mountain.
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