A research study reports that a particular educational program has improved the prospects
A. The parents of preschool children in the United States are attracted to educational fads and do not have a clear idea of what sorts of early education programs might benefit their children.
B. The cognitive abilities of children are constantly changing between ages three and five.
C. The researchers unwittingly included a substantial number of children who had been previously exposed to another educational enrichment program.
D. Many parents erroneously presume that early formal instruction takes up time that children could better spend exploring their worlds independently.
E. It would require extraordinary public expense to establish such educational enrichment programs on a national basis.
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Advertisers are often criticized for their unscrupulous manipulation of peoples tastes and
A. The advertisers switched their advertisements to other family newspapers.
B. Some advertisers switched from family newspapers to advertise in the changed publication.
C. The advertisers expected their product sales to increase if they stayed with the changed publication, but to decrease if they withdrew.
D. People who generally read family newspapers are not likely to buy newspapers that concentrate on sex and violence .
E. It was expected that the changed publication would appeal principally to those in a different income group.
Which of the following, if true, would provide most support for concluding from the survey
A. Changes in the level of drug use by high school seniors are seldom matched by changes in the level of drug use by other people below the age of 20.
B. In the past, high school seniors were consistently the population group most likely to use illegal drugs and most likely to use them heavily.
C. The percentage of high school seniors who use illegal drugs is consistently very similar to the percentage of all people below the age of 20 who use illegal drugs.
D. The decline revealed by the surveys is the result of drug education programs specifically targeted at those below the age of 20.
E. The number of those surveyed who admit to having sold illegal drugs has declined even faster than has the number who have used drugs.
In Argonia the average rate drivers pay for car accident insurance is regulated to allow insurance companies to make a reasonable profit. Under the regulations, the rate any individual driver pays never depends on the actual distance driven by that driver each year. Therefore, Argonians who drive less than average partially subsidize the insurance of those who drive more than average. The conclusion above would be properly drawn if it were also true that in Argonia
A. the average accident insurance rate for all drivers rises whenever a substantial number of new drivers buy insurance.
B. the average cost to insurance companies of insuring drivers who drive less than the annual average is less than the average cost of insuring drivers who drive more than the annual average.
C. the lower the age of a driver, the higher the insurance rate paid by that driver.
D. insurance company profits would rise substantially if drivers were classified in terms of the actual number of miles they drive each year.
E. drivers who have caused insurance companies to pay costly claims generally pay insurance rates that are equal to or lower than those paid by other drivers.
假设发现某微机的硬盘感染了病毒，现有 1张含有杀病毒软件的系统盘-软盘，在下面列出的不同操作方法中，较为有效的清除病毒的方法是()。
A. 不关机直接运行软盘中的杀病毒软件
B. 用硬盘重新自举后运行软盘中的杀病毒软件
C. 用含有杀病毒软件的系统盘重新自举后，再运行软盘中的杀病毒软件
D. 以上三者均可
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