According to the passage, a large number of children can be saved only when_____

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问题 According to the passage, a large number of children can be saved only when______. [br] When the mixture is used, it is important to______.

选项 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

答案 B

解析题目询问混合物要怎样服用才会对腹泻起作用。答案在文章的第三段。文章说到虽然这种混合物对腹泻并没有立竿见影的效果，但如果能坚持服用的话会对腹泻起作用的。所以正确答案为B。

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