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Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. What doe
Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. What doe
admin
2013-01-11
63
问题
Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the ______.
What does the author mean by saying "more challenging" in the last paragraph?
选项
答案
More demanding
解析
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本试题收录于:
大学英语三级B级题库大学英语三级分类
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大学英语三级B级
大学英语三级
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