People did not begin to use unmanned vehicles in undersea exploration until recently because of______. Which of the following i

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问题 People did not begin to use unmanned vehicles in undersea exploration until recently because of______.
Which of the following is NOT MENTIONED in the passage?

选项 A、New techniques are continually developed and new machines invented for undersea exploration.
B、If not well built, a submersible is most likely to get crushed in deep water.
C、A submersible, when manned looks very much like a spaceship.
D、In certain respects undersea exploration is often faced with the same problem as space travel is.

答案D

解析 参阅第二段第二句。可知海底探测和太空旅行并非面临同样问题,故D的表述为不正确,故选D。
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