单项选择题

The author of this passage was probably a______.

A．linguist
B．scientist
C．politician
D．physician
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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
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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