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题型：句子翻译 题类： 难易度：普通
外研版（2019）选择性必修 第一册Unit 6 Nurturing nature分层跟踪检测1
Environmentalists are trying to the endangered species .
Young children have a limited attention span and can't {#blank#}1{#/blank#} {#blank#}2{#/blank#} one activity for very long.
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