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单项选择题

A．The price for the coffee is fair.
B．The price is cheap.
C．The price is expensiv
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单项选择题The aim of the voyages Maury was responsible for in the 1840s was to ______.

A．make some sounding experiments in the oceans
B．collect samples of sea plants and animals
C．estimate the length of cable that was needed
D．measure the depths of the two oceans

单项选择题Defied in the 5th paragraph probably means ______ .

A．doubted
B．gave proof to
C．challenged
D．agreed to