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问题 选择题

1453年，延续了一千多年的拜占庭帝国被奥斯曼土耳其灭亡。盛极一时的帝国灭亡的教训启示我们[ ]

A．要以排外的心理对待外来文化       

B．开放宽容才能繁荣，保守狭隘必将衰落

C．走向辉煌后必然走向灭亡            

D．只有扩展才能促进经济发展

答案

答案：B

单项选择题

一级强化物又被称为()

A．次级强化物

B．条件强化物

C．非条件强化物

D．社会强化物

E．非社会强化物
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填空题



Despite (1) that alcoholic beverages may (2) , a leading medical expert is advising: don’t (3) just yet.
Anybody who’s ever worked in a hospital sees the hospital is full of patients that have (4) disease, but the hospital is not full of patients that have disease related to cholesterol and (5) .
In an (6) in the current New England Journal of Medicine, Dr. Goldberg of Columbia University said it is time to see (7) prevents heart disease. Such a study would give (8) to one group of heart disease patients and not to another, and see (9) .
In the latest study, which followed (10) over a 12-year period, researchers found that those who drank (11) drinks per week (12) of heart attack by (13) compared to (14) .
The lead author, (15) Kenneth Mukamal of Beth Israel Deaconess Medical Center in Boston, insists his study is (16) . For one thing, other studies have not looked at (17) .
Dr. Mukamal says (18) also appear to settle which alcoholic beverage are (19) . "Beer and spirits, beer and liquor, were most ply (20) ."
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