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

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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 ______.

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

大学英语三级B级

大学英语三级

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

大学英语三级B级

大学英语三级

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