单项选择题

According to the experiment, what problem can insufficient sleep cause in students（）

A．Declining health.
B．Lack of attention.
C．Loss of motivation.
D．Improper behavior.

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单项选择题
According to the passage, why haven’t scientists found a cure for the common cold（）

A．They haven’t devoted as much energy to medicine as to space travel.
B．There are too many kinds of cold viruses for them to identify.
C．It is not economical to find a cure for each type of cold.
D．They believe people can recover without treatment.
单项选择题
What do we learn from the conversation about Miss Rowling’s first book（）

A．It was about a little animal.
B．It took her six years to write.
C．It was adapted from a fairy tale.
D．It was about a little girt and her pet.
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