单项选择题


Questions 16 to 20 are based on the following talk.

A． It is the most common sleeping problem that people are suffering from.
B． About 8 to 10 percent of adult population have this problem.
C． During sleep bruxism, a person’s teeth make contact for 40 minutes a day.
D． During sleep bruxism, the upper and lower teeth may come into contact with 250 pounds of pressure.
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单项选择题
A． Because they show more about the novel that they’re based on.B． Because we are too close to them to see that they are reflections of current attitude.C． Because directors are trying to get inside the minds of the 19th century people.D． Because they are really rooted in the period they were made.
A． Because they show more about the novel that they’re based on.
B． Because we are too close to them to see that they are reflections of current attitude.
C． Because directors are trying to get inside the minds of the 19th century people.
D． Because they are really rooted in the period they were made.
单项选择题
A． An energy bill has been approved by the full House of Representatives.B． The legislation would promote production of renewable motor fuels.C． President George W. Bush has signed the bill.D． Fuel efficiency of cars and trucks was already raised by 40% in the U.S..
A． An energy bill has been approved by the full House of Representatives.
B． The legislation would promote production of renewable motor fuels.
C． President George W. Bush has signed the bill.
D． Fuel efficiency of cars and trucks was already raised by 40% in the U.S..
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