What was the obesity rate among the general Britons in 1980？
A. 15%
B. 17%
C. 7%
D. 5%
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Among the following factors, which contribute(s) to the short life expectancy of the Americans than Britons？
A. Traffic accident.
B. Homicide rate.
C. Inadequate access to the Medical Insurance by the Americans.
D. Both A and
What docs the speaker say about the collaboration amongst members of the Royal Society？
A. There is a smooth collaboration amongst members of the Royal Society.
B. The collaboration amongst members of the Royal Society is often jeopardized by priority and patent issues.
C. There is no collaboration amongst members of the Royal Society at all.
D. There was a close and smooth collaboration amongst members of the Royal Society on priority and patent issues.
听力原文：The landlord collects rent on the first of the month without fail.
How can this statement be interpreted？
A. The tenants absolutely must pay rent at the beginning of the month.
B. The landlord might fail to collect your rent on the first of next month.
C. You should call the landlord about rent on the first of the month.
What is the speaker's opinion toward the group model of scientific activities？
A. In some sense the contribution made by the group model is even more lasting than that made by the individual model.
B. The "group model" onsisted of nonprofessionals and made little contribution to scientific development.
C. The "group model" conducted just as many scientific experiments as the individual model.
D. The "group model" made many standards to restrict the scientific practice of the individual model.
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