单项选择题

In the summer holidays, the library will have ______.

A．no special hours
B．special hours on weekdays
C．special hours on weekends
D．special hours both on weekdays and weekends
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单项选择题
We may infer that during the summer holidays ______.
A．few students will stay in the university
B．no breakfast will be served on weekends
C．the. student newspaper will sell more copies
D．there will be a concert or a film each Wednesday
单项选择题
Which of the following gives a general idea of how the noise-killing system works
A．By producing pressure waves going in the opposite direction.
B．By mixing high frequency sound waves with low frequency sound waves.
C．By mixing new sound waves with the noise and sending them out together.
D．By making copies of the unwanted sound waves and letting them out a little later.
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