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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正确答案
试题解析
根据文章第三段，it keeps fluid (体液) levels normal until the body has fought off the harmful bacteria.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。因此B选项正确。
