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Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. Why
Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. Why
admin
2014-10-11
62
问题
Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the ______.
Why is ocean exploration not so expensive as space travel?
Because ______ for submersibles to get away from the Earth’s gravity.
选项
答案
there’s no need
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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