单项选择题

When the mixture is used, it is important to ______.

A．keep sugar and salt in water
B．drink it as often as necessary
C．take it as much as possible
D．use it to kill the bacteria
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单项选择题
According to the passage, a large number of Children can be saved only when ______.
A．the life-saving ways are medically effective
B．their parents are rich enough for the life-saving techniques
C．the life-saving techniques are easy to use
D．their parents learn the life-saving techniques
单项选择题
In resent years, computers are being made ______.
A．larger and more expensive
B．smaller and cheaper
C．more hard to use
D．to work more slowly
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