18.Work your brain!
Between 2and 3pounds of wonder,it controls everything we say,do or think,who we are and what we care about,the way we walk or laugh or figure out things,what we like and the talents we possess,how we see and talk and run and jump and process our food.
The brain uses 20percent of our body's oxygen and 20percent of its blood.Somewhere within its protein,fat,100,000miles of blood vessels and 100billion nerve cells,it helps us remember where we put our gym shoes.Change our temperature so we don't die because of the heat or cold.Speed us up or slow us down.Help us choose between orange juice or orangeflavored drinks.
Its complexity is stunning,far beyond anything most of us can imagine.To keep this work of art as polished as possible we need to eat right,exercise and keep mentally stimulated.
Good nutrition helps brain cells communicate with each other.Exercise stimulates a hormone in our brain that improves memory.Mental stimulation keeps you sharp even as you age.
"It's very important that we tell people to be physically active and mentally active,"said neurologist Malcolm Stewart.
"People cannot stop aging,but you're able to reduce the damage; you're able to keep the function up."
Following are Dr.Stewart's advice for improving brain health:
•Nutrition
Avoid fast food.Follow the old adage(格言):For breakfast,eat like a king; for lunch,like a
queen; for supper,like a beggar.
•Exercise
Do a combination of stretching aerobic and musclestrengthening every day.
•Mental games
Try to have a sense of hope about the future.Do puzzles.Listen to music.Reach out to others to make their lives better.
1.The purpose of the author in writing this passage is toB.
A.inform us how the brain works
B.give us advice on how to keep the brain healthy
C.tell us that the brain plays an important role in our lives
D.show how special the brain is to us
2.The word"stunning"in Paragraph 5meansD.
A.interesting
B.strange
C.significant
D.a(chǎn)mazing
3.According to the text,more exerciseB.
A.keeps our mind sharp
B.helps improve our memory
C.gives our brain a rest
D.is good for brain cells communicating with each other
4.In order to keep brain healthy,we should avoidC.
A.eating a good lunch
B.doing puzzles
C.eating a large supper
D.taking aerobic exercise.
分析 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了給大腦保健的方法:合理的營養(yǎng)、適度的運動和智力活動.
解答 1.B.推理判斷題.文章第一、二段介紹大腦的神奇,意在喚起讀者對于大腦的贊嘆并為下文"大腦保健"進行鋪墊.然后以To keep this work of art (杰作)as polished as possible we need to eat right,exercise and keep mentally stimulated.一句揭示作者的寫作意圖.故選B.
2.D.詞義猜測題.文章前半部分Its complexity is stunning,far beyond anything most of us can imagine介紹了大腦的精巧和復雜.這種精巧和復雜遠遠超出人們的想象,令人驚嘆.故選D.
3.B.細節(jié)理解題.由第三段Exercise stimulates a hormone in our brain that improves memory.一句可知,運動可刺激大腦里有助于改善記憶的荷爾蒙的分泌.故選B.
4.C.細節(jié)理解題.從表格中For breakfast,eat like a king; for lunch,like a queen; for supper,like a beggar.一句可知,給大腦保健所需要的合理營養(yǎng)要求早飯、午飯吃好,避免豐盛的晚餐.故選C.
點評 考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.