单项选择题


A．In San Francisco.
B．At an airport.
C．At a travel agency.
D．In a post office.
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单项选择题
A．afterB．atC．forD．into
A．after
B．at
C．for
D．into
单项选择题
What do we know from the first paragraph
A．No mineral companies have succeeded in deep-sea mining.
B．Oil and gas have been regarded as the most useful deep-sea wealth.
C．Only oil and gas industry has been interested in deep-sea mining.
D．The deep-sea mineral wealth has recently become the dream of miners.
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