[简答题]Experiments have shown that colors, partly because of their physiological associations, also have a direct psychological effect.

[简答题]Experiments have shown that colors, partly because of their psychological associations, also have a direct psychological effect.

[填空题]People have time for more experiences partly because they are ______.

[填空题]Contaminated toothbrushes have been already shown to transmit viruses and bacteria.

[单项选择]Police statistics have shown that automobile antitheft devices reduce the risk of car theft, but a statistical study of automobile theft by the automobile insurance industry claims that cars equipped with antitheft devices are, paradoxically, more likely to be stolen than cars that are not so equipped:
Which one of the following, if true, does the most to resolve the apparent paradox ？（）
A. Owners of stolen cars almost invariably report the theft immediately to the police but tend to delay notifying their insurance company, in the hope that the vehicle will be recovered.
B. Most cars that are stolen are not equipped with antitheft devices, and most cars that are equipped with antitheft devices are not stolen.
C. The most common automobile antitheft devices are audible alarms, which typically produce ten false alarms for every actual attempted theft.
D. Automobile owners who have particularly theft-prone cars and live in areas of greatest incidence of car theft are those who are most likely to have antitheft devices installed.
E. Most automobile thefts are the work of professional thieves against whose efforts antitheft devices offer scant protection.

[简答题]Both research and practical experience have shown that a （）(均衡的饮食对健康是必不可少的).

[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).

[填空题]Some of these studies have shown that although some people have trouble to fall asleep, others have an equally difficult time waking up.

• A. have shown
• B. to fall asleep
• C. equally
• D. waking up

[简答题]Other tests have shown that laughter appears to be able to re- duce the effect of pain on the body.

[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.

[简答题]Previous studies have shown the longer the mom breastfeeds, the more benefit for her body.

[单项选择]Which of the following have studies shown has the greatest impact on the return of a portfolio（　）
A. Security selection.
B. Target asset allocation.
C. Market timing.

[单项选择](三) Researchers have shown that noise can adversely affect human in both physiological and psychological ways. Hearing losses in particular occupations such as ship - building and con- structi - on work are well - known. In fact, however, we all find hearing more difficult as we age. Young ears can distinguish a wide range of sounds from low to very high frequencies, while older ears lose the ability to distinguish high -pitched sounds. A comparison of people living in some industrialized and non - industrialized areas suggests that this hearing loss may not necessarily accompany old age. Furthermore, a closer inspection of other data reveals economic effects. For instance, an increased turnover in property has been observed in noisy areas near airports. Job performance can be adversely affected by loud noise, especially if accuracy and mental effort are involved. The use of outdoor areas for conversation is not possible for an estimated 5 to 10 million people who live or work
A. young people are sensitive to high -pitched sounds
B. young people distinguish low frequency noise better than old people
C. high frequency noise can cause hearing loss in old people
D. people in industrialized areas will suffer hearing loss when they are old

[填空题]The colors red, white and blue have a connection with the American flag.