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题型：单选题 题类：常考题 难易度：困难
北师大版小学英语六年级上册unit 7 The mountain bike race单元测试（一）
The Earth was{#blank#}1{#/blank#}and{#blank#}2{#/blank#}in the past，but now some parts are{#blank#}3{#/blank#}．We should stop throwing{#blank#}4{#/blank#}into rivers．We should stop cutting{#blank#}5{#/blank#}so many trees and using{#blank#}6{#/blank#}bags．
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