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

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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

大学英语三级B级

大学英语三级

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