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题型：翻译 题类：常考题 难易度：普通
人教版（新课程标准）高中英语必修3 Unit 4同步练习二
the accident has an effect on the environment or not.
Yellowstone {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} the variety of its wildlife.
I'm always very nervous {#blank#}1{#/blank#} I take an exam.
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