单选题After removing several obsolete programs from a PC, a user is experiencing slower than usuallyprocessing times. Which of the following would be the BEST way to speed up the processing? （）AUse an external hard drive.BDefrag the hard drive.CAdd more RAM to the computer.DInstall a larger hard drive.
单选题
After removing several obsolete programs from a PC, a user is experiencing slower than usuallyprocessing times. Which of the following would be the BEST way to speed up the processing? （）
A
Use an external hard drive.
B
Defrag the hard drive.
C
Add more RAM to the computer.
D
Install a larger hard drive.
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共用题干About eight million school-age children are home alone after school.These are the hours when the number of violent crimes peaks and when youths are most likely to experiment with alco- hol,tobacco,and drugs. Many older children take care of themselves after school for an hour or two until a parent comes home,and research suggests that some of these children are more at risk of poor grades and risky behaviors.Studies have been done to find out what helps to reduce these kinds of risky behaviors among youths .One study of Chicago neighborhoods showed that after-school programs resulted in less vio- lence even in poor neighborhoods.After-school programs can help to reduce crime and violence because they offer activities to children and youths during their out-of-school time.In addition to helping youths make use of af-ter-school hours,after-school programs provide teens with opportunities to develop caring relation-ships with adults.Studies have found that high-quality relationships with parents and other adults, as well as good use of time,are very important for healthy development in youth.After-school programs can also be used for teens who hang out at friends' houses and play basketball when a parent or other responsible adult is at home.The programs can also be helpful for formal after-school activities,including"drop-in"programs that are provided by organizations.Despite the benefits of after-school programs,there are many reasons why some parents do not use them. Programs may be too expensive,of poor quality,or hard to join.Some older children and young teens may refuse to attend programs that seem like they are just child care.Parents may feel uncertain about how much freedom is proper for children and youths who are beyond the tradition-al child care years.However,research supports the effectiveness of these programs in protecting middle school and high school youths from risk and harm. What can we infer from the passage?A: Teenagers tend to stay at their friends' houses for a long time.B: Relationships with adults may cause unhealthy development in youths.C: The after-school programs can be used for many different kids.D: Teenagers do not like the after-school programs.
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