资料类型：英语四级考试完型填空
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发布时间：06-17 20:54
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英语四级完形填空模拟题六(附答案详解)免费下载
the world about us.When humans first __1__ , they were like newborn children, unable to use this __2__ tool.Yet once language developed, the possibilities for human kind‘s future __3__ and cultural growth increased.
Many linguists believe that evolution is __4__ for our ability to produce and
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