单项选择题

A．the life-saving ways are medically effectiveB．their p……

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

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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

单项选择题Which of the following situations will cause the death of a child

A．The child clears its body of bacteria.
B．The body loses liquids without any control.
C．The child has diarrhea in a developing country.
D．The body controls its fluid levels.