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[不定项选择题]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. Which of the following is NOT true according to the passage?
A.The grades of those children who are home alone after school are more likely to suffer.
B.Parents want to give their children as much as possible freedom.
C.The after-school programs help the students to make use of the time after school.
D.The after-school programs are effective in protecting middle school and high school youths from risk and harm.

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Young Adults Who Exercise Get Higher IQ Scores

Young adults who are fit have a higher IQ and are more (51) to go on to university, reveals a major new study carried out at the Sahlgrenska Academy arid Sahlgrenska University Hospital.
The results were recently published in the Proceedings of the National Academy of Sciences (PNAS). The study involved 1.2 million Swedish men doing military service who were born between 1950 and 1976. The research group analyzed the (52) of both physical and IQ tests the youngsters took fight after they started serving the army.
The study shows a clear link (53) good physical fitness and better results for the IQ test. The strongest links are for (54) thinking and verbal comprehension. But it is only fitness that plays a (55) in the results for the IQ test, and not strength. "Being fit means that you also have good heart and lung (56
A. what
B. why
C. how
D. where