单项选择题

Man uses the energy for everything from flying to the moon to ______ about it.

A． think
B．thought
C．thinking
D．will think
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单项选择题
Although baleen whale may weigh ______ twenty elephants, it feeds on sea plants and animals.
A．so much to
B．as much to
C．so much as
D．as much as
单项选择题
The oil industry of India ______ two World Wars and withstood the economic, social and political upheavals of a particularly troubled century.
A．survived
B．has survived
C．was survived to
D． has been surviving
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