Question

7．Teenagers believe anything is possible if thy study hard．But they often forget to think about healthy diets（飲食），enough sleep time and exercise．In fact，these things are really important for them to keep fit．
  It is important for teenagers to get enough energy．Teenage girls need about 2200 calories a day while boys need a bit more-doctors suggest 2800 for teenage boys 50% of their calories should come from healthy food-rice，begetables and fruit．People often say an apple a day keeps the doctor away．Teenagers also need to drink a lot of water，6 to 8 glasses a day．Drinking enough water will improve their skin．
  Teenagers usually need eight to ten hours'sleep at night，but many Chinese teenagers do not get enough sleep．A report shows that without a good night's sleep，teenagers seem to be weaker than they should be．Too much homework is not the only reason why teenagers stay up late．Some watch TV or play computer games late into the night．Teenagers should develop good study habits．So some clever students never study late，but they are able to work well in class．
  Exercise is something that can help them．Experts suggest that teenagers should spend at least 30 minutes exercising a day，five times a week．They will feel relaxed when they exerxise．It can even help them sleep better at night．

46．How many things are important for teenagers to keep fit？B
A.2                    
B.3                  
C.4
47．Half of their calories should come fromA．
A．rice，vegetables and fruit  
B．rice，vegetables and meat 
C．rice，vegetablesand water
48．The last paragraph（段）mainly talks aboutC．
A．sleeping better      
B．basic energy      
C．necessary exercise 
49．Which of the following is NOT true？A
A．Boys need much more calories than girls
B．Teenagers need to drink 6 to 8 glasses of water a day
C．Some clever students never study late
50．The passage tells teenagers how toC
A．eat and drink well      
B．study hard    
C．keep fit．

Answer 1

分析 全文大意：
青少年認為如果他們努力學(xué)習(xí)一切皆有可能．但是他們常常忘記了考慮健康飲食、充足的睡眠時間和鍛煉．實際上這些事情對他們的健康的確很重要．對青少年來說獲取充足的能量很重要．十來歲的女孩一天大約需要2200卡路里的能量，而十來歲的男孩稍微多一點，醫(yī)生建議2800卡路里的能量．50%的卡路里應(yīng)該來自健康飲食：米飯、蔬菜和水果．人們經(jīng)常說"一天一蘋果，不用請醫(yī)生"青少年也需要喝大量的水，一天6至8杯．和足夠的水能改善他們的皮膚．青少年晚上通常需要8到10小時的睡眠時間．但是許多中國青少年睡眠不足．一項報告表明沒有好的夜間睡眠．青少年身體狀況看起來比正常情況要差．大量的家庭作業(yè)并不是青少年熬夜的唯一原因．一些青少年看電視或玩電腦游戲到深夜．青少年應(yīng)養(yǎng)成好的學(xué)習(xí)習(xí)慣．所以一些聰明的學(xué)生從不學(xué)到很晚，但是他們在課堂上學(xué)得很好．鍛煉也能有助于他們的身體．專家建議青少年應(yīng)一周五次，每天至少鍛煉30分鐘．當他們鍛煉時他們會感到放松．鍛煉甚至有助于他們晚上的睡眠．

解答 答案：
46．B      細節(jié)理解題      根據(jù)第一段中But they often forget to think about healthy diets（飲食），enough sleep time and exercise．In fact，these things are really important for them to keep fit．"但是他們常常忘記了考慮健康飲食、充足的睡眠時間和鍛煉．實際上這些事情對他們的健康的確很重要"可知對青少年來說保持健康有三件事即飲食、睡眠和鍛煉．故選B
47．A      細節(jié)理解題      根據(jù)第二段Teenage girls need about 2200 calories a day while boys need a bit more-doctors suggest 2800 for teenage boys 50% of their calories should come from healthy food-rice，vegetables and fruit．"十來歲的女孩一天大約需要2200卡路里的能量，而十來歲的男孩稍微多一點，醫(yī)生建議2800卡路里的能量．50%的卡路里應(yīng)該來自健康飲食：米飯、蔬菜和水果"可知一半的能量來自米飯、蔬菜和水果，故選A．
48．C      段落大意題      根據(jù)最后一段的第一句Exercise is something that can help them"鍛煉也能有助于他們的身體"可知這一段主要講述鍛煉的必要性．故選C
49．A      細節(jié)理解題      通讀全文第二段中提到Teenagers also need to drink a lot of water，6 to 8 glasses a day可知青少年一天需要6至8杯水，故B項正確；第三段中提到some clever students never study late可知一些聰明的學(xué)生從不學(xué)到很晚，故C項描述正確，最后根據(jù)第二段Teenage girls need about 2200 calories a day while boys need a bit more-doctors suggest 2800 for teenage boys"十來歲的女孩一天大約需要2200卡路里的能量，而十來歲的男孩稍微多一點"可知男孩需要的卡路里比女孩稍微多一點，并非多得多，故A項不正確，故選A
50．C     主旨大意題      根據(jù)短文第一段Teenagers believe anything is possible if thy study hard．But they often forget to think about healthy diets（飲食），enough sleep time and exercise．In fact，these things are really important for them to keep fit．"青少年認為如果他們努力學(xué)習(xí)一切皆有可能．但是他們常常忘記了考慮健康飲食、充足的睡眠時間和鍛煉．實際上這些事情對他們的健康的確很重要"，然后在接下來的三段中分別從飲食、睡眠和鍛煉三個方面介紹如何保持健康．可知短文主要告訴青少年如何保持健康，故選C．

點評 這是一篇健康環(huán)保類的說明文．做題時先把文章快速通讀一遍抓住其大意．該題涉及細節(jié)理解題和主旨大意題，要結(jié)合問題從文中找到與之相關(guān)的句子，抓住關(guān)鍵詞和細節(jié)進行選擇，和選項進行比對快速選出答案．