2. 外语
  3. 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

admin2013-01-11  70
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
转载请注明原文地址:https://kaotiyun.com/show/swrK777K
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)