单项选择题

"Defied" in the fifth paragraph probably means" ______ ".

A．doubled
B．gave proof to
C．challenged
D．agreed to
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单项选择题
What do you think might be the reason he is finding it so difficult to get a job
A．He is asking for too much money.
B．He has no real training.
C．He wants to be a gardener or caretaker.
D．His character is not good enough.
单项选择题
This passage is mainly about ______.
A．the beginning of oceanography
B．the laying of the first undersea cable
C．the investigation of ocean depths
D．the early intercontinental communications
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