单项选择题

The importance of the sea includes all of the following, except______.

A．for transportation
B．for sanitation
C．for recreation
D．for additional fresh water
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单项选择题
It can be inferred from the passage that ______.
A．clear water on earth is unlimited.
B．fossil fuels and nuclear energy are more important than falling water from dammed-up rivers
C．part of the water used by a person or a community may eventually be used by others
D．most of the earth's hydroelectric potential has been exploited
单项选择题
According to the passage water is important for all of the following, except______.
A．early international trade
B．the most common substance in living plant and animal tissues
C．hydroelectric power stations
D．sanitation and recreation
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