单项选择题

The author's main purpose in the passage is to ______.

A．describe a phenomenon
B．argue a belief
C．propose a solution
D．stimulate action
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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
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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