单项选择题

The passage tells us that cats ______.

A．sleep longer than humans
B．have similar sleeping habits as humans
C．have no regular sleep
D．take naps besides their regular sleep
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单项选择题
Some experts believe that
A．cats have a natural clock inside them
B．people can live better by taking naps
C．people should learn from cats
D．famous people are all known for their energy
单项选择题
What is true of American education
A．It included everyone from the beginning.
B．High schools are not free to all the children.
C．All children have rights to receive education.
D．There are no entrance exams for all levels of education.
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