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
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
单项选择题
Which of the following can help children have the experiences dealing with the floatability of liquids
A．observing the chemicals that dissolve in water.
B．watching water evaporate.
C．investigating how objects sink or float in water.
D．observing how candle wax changes its state.
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