单项选择题

The research done by the Dement commission shows that Americans ______.

A．don't like to take naps
B．are terribly worried about their national debt
C．sleep less than is good for them
D．have caused many industrial and traffic accidents

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单项选择题

______ people sat in the car.

A．Six
B．Less than six
C．Seven
D．Five

单项选择题

We were not glad to have Aunt Clara's family with us because ______.

A．she and four boys
B．our house was small
C．it was the weekend
D．her family was not small