2. 外语
  3. Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. Why is o

Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. Why is o

admin2013-01-11  50
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
转载请注明原文地址:https://kaotiyun.com/show/zwrK777K
本试题收录于： 大学英语三级B级题库大学英语三级分类
0

大学英语三级B级

大学英语三级

相关试题推荐
随机试题
最新回复(0)