单项选择题

You miss the first bus ______ you start earlier.

A．if
B．or
C．until
D．unless

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热门试题

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.

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