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

We can learn from the passage that________.

A．as far as energy source is concerned, salt water is useless because of its chemical properties
B．the working principle of an vibrating water column is to use water as a direct power driving a generator
C．Britain is pursuing a method that the Japanese have already put into practice
D．Britain is the most advanced country in developing new energy source

单项选择题

The word depleted (Line 1, Para. 1) possibly means ________ .

A．exhausted
B．discarded
C．polluted
D．disappeared