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Dear Sir or Madam,
I’ m Li Ming, a sophomore majoring i......

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单项选择题
The aim of the voyages Maury was responsible for in the 1840 was ______.
A．to make some sounding experiments in the oceans
B．to collect sample of sea plants and animals
C．to estimate the length of cable that was needed
D．to measure the depths of the two oceans
单项选择题
This passage is mainly about ______.
A．the beginnings 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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