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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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
单项选择题
The last sentence of the fourth paragraph is intended to tell readers that______.
A．society's demands upon and for clean water are increasing
B．no person has the right to waste water
C．without water, there could be no life
D．everyone should be concerned about how water is used because the water a person uses will be used by future generations
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