4.How much physical activity do you get?As a teenager,physical activity is important,not just for your future health but for looking and feeling your best now.How active you are early in life may affect how ableminded you are late in life.That was the finding of a new study of cognitive impairment (認知障礙),or a loss in mental abilities.
The study involved more than nine thousand women in the United States over the age of sixtyfive.They answered questions about their level of physical activity as teenagers and at age thirty,fifty and late in life.
Laura Middleton of the Sunnybrook Health Sciences Center in Canada led the study.Laura Middleton said,"People who were physically active on a regular basis had lower risk of cognitive impairments in late life.And it seemed that teenage physical activity was particularly important in terms of the prevention of cognitive impairments."
Laura Middleton noted two longlasting effects that physical activity can have on teenagers.Exercise could help strengthen the blood vessels(血管) that carry blood and oxygen to the brain.Also,physical activity is known to improve the brain's ability to repair itself.Moreover,she noted that doing exercise is good for psychological development.
The study is in the Journal of the American Geriatrics Society.Women who said they were physically active even once a week showed less cognitive impairment as measured by a test.There was not a strong link between the amount of physical activity and the seriousness of impairment.But the link was strongest among those who were active as teenagers.
Laura Middleton says other studies of exercise and cognitive skills have found a stronger link in women than in men.Still,she says,there is no reason to suggest that the finding about teenage physical activity should not apply to men as well.
21.The passage mainly talks about the fact thatD.
A.women are generally more active than men
B.teenagers today are involved in more physical activity
C.people's level of physical activity varies at different ages
D.physical activity in teens is linked to mental skills in late life
22.What do we know about the study?C
A.People surveyed are all physically active.
B.It was carried out online.
C.Most people surveyed are elderly ladies.
D.It is a worldwide study.
23.We can infer from the last paragraph thatB.
A.men's cognitive skills are not related to the amount of exercise
B.male teenagers should also get involved in physical activity
C.men have greater cognitive skills than women
D.men do more physical exercise than women
24.This passage is most probably taken fromC.
A.a(chǎn) science book 
B.a(chǎn) personal diary
C.a(chǎn) health report
D.a(chǎn) travel magazine.

分析 本文是一篇科教類閱讀,屬于研究報告.你有多少身體運動?作為一個青少年,身體運動很重要,不僅僅是為了你未來的健康,而是為了尋找和感受你現(xiàn)在最好的一天.本文主要討論的是早期運動生活可能會影響到你在生活后期的能力.

解答 21.D.細節(jié)理解題.根據(jù)How active you are early in life may affect how ableminded you are late in life.可知,本文主要討論的是早期運動生活可能會影響到你在生活后期的能力.故選D.
22.C.細節(jié)理解題.根據(jù)The study involved more than nine thousand women in the United States over the age of sixtyfive.可知,大多數(shù)受訪者都是年長的女士們.故選C.
23.B.推理判斷題.根據(jù)there is no reason to suggest that the finding about teenage physical activity should not apply to men as well.可知,男性青少年也應(yīng)該參與體育活動.故選B.
24.C.推理判斷題.閱讀全文,根據(jù)文章內(nèi)容可知,這篇文章主要圍繞一項關(guān)于早期運動生活可能會影響到你在生活后期的能力的研究,應(yīng)該源于一份健康報告.故選C.

點評 本文是一篇科教類閱讀,題目涉及多道細節(jié)理解題,推理判斷題.做題時學生應(yīng)仔細閱讀原文,把握文章主要內(nèi)容,聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項含義,從中選出正確答案,一定要做到有理有據(jù),切忌胡亂猜測.

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