[单项选择]Studies have shown that people who rarely take antibiotics, which are antibacterial drugs, have stronger immune systems than do people who take antibiotics frequently. Yet there is no evidence that taking antibiotics weakens the immune system.
Which of the following, if true, best reconciles the apparent discrepancy in the information above ？（）
A. People who have strong immune systems seldom get the kinds of infections for which people normally take antibiotics.
B. People who have strong immune systems are seldom aware that their immune systems are unusually strong.
C. People who have weak immune systems have great difficulty recovering from bacterial infections if they do not take antibiotics.
D. Some people take antibiotics even though the antibiotics cause a variety of side effects.
E. Some people take antibiotics frequently because their doctors prescribe antibiotics for viral infections as well as for bacterial infections.

[填空题]Studies have shown that students who take several tests learn more than _________________________________(看完资料只参加一次测试的学生).

[单项选择]Researchers at the University of Toronto have taken important steps toward producing a profile of an abusive parent. Prof. Gary Walters and doctoral student Lynn Oldershaw of the Department of Psychology have developed a system to characterize parents who physically abuse their children. This could ultimately allow social service professionals to identify parents in child abuse. Over the last five years, Walters and Oldershaw, in collaboration with Darlene Hall of the West End Creche, have examined over 100 mothers and their three-to-six-year-old children who have been physically abused. In the laboratory, the mother and child spend 30 minutes in structured activities such as playing, eating and cleaning-up. The family interaction is videotaped and later analyzed.
The researchers have developed a system, which allows them to record the effectiveness of parenting skills. They are particularly interested in disciplinary strategies because abuse most commonly occurs when the parent
A. Therapy tailored for the individual needs of the abusive parents.
B. Interaction between mother and child.
C. The mother’s parenting skills.
D. Parents’ disciplinary strategies.

[填空题]

What have people who listened to the radio regularly ever experienced

[单项选择]Studies reveal that people spend two hours dreaming every night, no matter what they（　）during the day.
A. should do
B. would have done
C. may have done
D. must do

[单项选择]

Surprisingly enough, modem historians have rarely interested themselves in the history of the American South in the period before the South began to become self-consciously and distinctively "Southern"——the decades after 1815. Consequently, the cultural history of Britain’s North American empire in the seventeenth and eighteenth centuries has been written almost as if the Southern colonies had never existed. The American culture that emerged during the Colonial and Revolutionary eras has been depicted as having been simply an extension of New England Puritan culture. However, Professor Davis has recently argued that the South stood apart from the rest of American society during this early period, following its own unique pattern of cultural development. The case for Southern distinctiveness rests upon two related premises: first, that the cultural similarities among the five Southern colonies were far more impressive than the differences, and second, t
A. dying out as Puritan influence began to grow
B. self-consciously and distinctively Southern
C. more characteristic of the Southern colonies than of England
D. spreading to Massachusetts and Connecticut

[单项选择]

Surprisingly enough, modern historians have rarely interested themselves in the history of the American South in the period before the South began to become self-consciously and distinctively " Southern"—the decades after 1815. Consequently, the cultural history of Britain’s North American empire in the seventeenth and eighteenth centuries has been written almost as if the Southern colonies had never existed. The American culture that emerged during the Colonial and Revolutionary eras has been depicted as having been simply an extension of New England Puritan culture.
However, Professor Davis has recently argued that the South stood apart from the rest of American society during this early period, following its own unique pattern of cultural development. The case for Southern distinctiveness rests_ upon two related premises: first, that the cultural similarities among the five Southern colonies were far more impressive than the differences, an
A. New England itself
B. England
C. Mississippi
D. Connecticut