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第1题

在人类信息传播发展的历史中,科学技术创新都会导致当时某种信息传播方式的重大变化。
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第2题

The engineers in this lab spent several weeks _______ their plans for the new bicycle. 　A. counting B.stripping C.ela
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第3题

Many kinds of animals are believed to have _________ from the earth 　A. withdrawn B.vanished C.found D.hung
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第4题

.The _______ work continued for more than a week but there was still no sign of the missing boy. 　A. research B.rescu
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