单项选择题

A．The strength of ocean currents.
B．The movement of sediment deep in the ocean.
C．A new way of measuring the depth of the ocean.
D．The best methods for studying deep ocean processes.
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填空题
People renewed their interest in natural gas as a fuel as a result of ______ of the late 1960s and early 1970s.
单项选择题
A．At a concert.B．In a museum.C．In a movie theater.D．At a dinner party.
A．At a concert.
B．In a museum.
C．In a movie theater.
D．At a dinner party.
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