单项选择题

According to the first two paragraphs,________.

A．the use of water is a completely new concept
B．the sea has long been used as a way of power
C．water is a source of energy far more economical than any other energies
D．water, if properly handled, may present a promising solution to energy crisis

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单项选择题

By saying ... were being joined by flow of converts the author implies that American consumers ________.

A．believed in a particular religion
B．were reluctant to change their established belief in materialism
C．accepted one kind of political principle
D．gradually began to accept a belief of simplicity

单项选择题

What is the passage mainly about

A．Energy crisis.
B．Water as a possible solution to energy crisis.
C．History of the use of water as a source of work energy.
D．Properties of water.