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Work your brain!
Between 2 and 3 pounds 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 20 percent of our body’s oxygen and 20 percent of its blood. Somewhere within its protein, fat, 100,000 miles of blood vessels and 100 billion 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 are 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 muscle strengthening 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 to ______.
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 underlined word “stunning” means ______.
A. interesting B. strange C. significant D. amazing
3.According to the text，more exercise ______.
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 avoid ______.
A. eating a good lunch B. doing puzzles
C. eating a large supper D. taking aerobic exercise
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In my dual (双重的) profession __36__ an educator and health care provider，I have worked with many children infected with HIV. They have taught me so many things, but I have especially learned that great __37__ can be found in the smallest individuals. Let me tell you about Tyler.
Tyler was __38__ infected with HIV；his mother was also infected. From the very beginning of his life，he was dependent on medications to __39__ him to survive. When he was five, he had a tube inserted in a vein(静脉) in his chest. At times, he also needed extra oxygen to support his __40__.
Tyler wasn't __41__ to give up one single moment of his childhood to this deadly disease. It was not __42__ to find him playing and racing around his backyard, wearing his medicine?loaded backpack and __43__ his tank of oxygen behind him in his little wagon (小手推车). All of us who knew Tyler were impressed by his pure __44__ in being alive and the energy it gave him. Tyler's mom often __45__ him by telling him that he moved so __46__ she needed to dress him in red. That way，when she peered through the window to check on him playing in the yard，she could quickly __47__ him.
This deadly disease eventually __48__ down Tyler. He grew quite ill and, unfortunately, __49__ did his HIV?infected mother. When it became __50__ that he wasn't going to survive, Tyler's mom talked to him about __51__. She comforted him by telling Tyler that she was dying too，and that she would be with him soon in heaven.
A few days before his death，Tyler __52__ to me to come to his hospital bed and __53__，“I might die soon. I'm not __54__. When I die，please dress me in __55__ . Mom promised she's coming to heaven, too.I'll be playing when she gets there, and I want to make sure she can find me.”
36．A.in B．for C．as D．on
37．A.pleasure B．pain C．sorrow D．courage
38．A.seriously B．born C．unlucky D．disappointingly
39．A.cause B．enable C．make D．lead
40．A.breathing B．living C．running D．walking
41．A.happy B．willing C．daring D．discouraged
42．A.common B．unusual C．surprised D．ordinary
43．A.dragging B．carrying C．pushing D．taking
44．A.character B．joy C．moment D．excitement
45．A.comforted B．scolded C．teased D．praised
46．A.slowly B．happily C．quickly D．fast
47．A.know B．spot C．stop D．observe
48．A.tore B．broke C．wore D．kicked
49．A.neither B．so C．such D．nor
50．A.apparent B．hopeless C．sure D．terrible
51．A.life B．dream C．future D．death
52．A.waved B．said C．signed D．explained
53．A.whispered B．shouted C．cried D．spoke
54．A.excited B．surprised C．scared D．happy
55．A.red B．white C．bright D．beauty
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阅读理解
阅读下列短文，从每题所给的四个选项中选出最佳选项。
Every animals is a living radiator (散热器)--heat formed in its cells and given off through its skin. Warm blooded animals keep a normal temperature by continuously replacing lost surface heat: smaller animals, which have more skin for every ounce of body weight, must produce heat faster than bigger ones. Because smaller animals burn fuels faster, scientists say they live faster. The speed at which an animal lives is determined by measuring the rate at which it uses oxygen. A chicken, for example, uses one-half cubic centimeters of oxygen every hour for each gram it weighs. The tiny shrew-mouse used four cubic centimeters of oxygen every hour for each gram it weighs. Because it uses oxygen eight times as fast, it is said that the shrew-mouse is living eight times as fast as the chicken. The smallest of the warm-blooded animals, the humming-bird, lives a hundred times as fast as an elephant. There is a limit to how small a warm-blooded animal can be. A mammal or bird that weighs only two and a half grams would starve to death. It would burn up its food too rapidly and would not he able to eat fast enough to supply itself more fuel.
1．The passage says that every animal is a living radiator because it _____.
[ ]
A．produces heat in its body cells
B．burns fuel to produce heat
C．sends out heat through its skin
D．takes in oxygen for burning fuel
2．Small animals are said to live faster than big ones because they _____.
[ ]
A．have more skin for their weight
B．replace lost heat faster
C．burn fuel faster than big ones
D．keep a higher body temperature
3．The amount of oxygen an animal uses depends on _____.
[ ]
A．the heat the body produces
B．the food it eats
C．its size and shape
D．the length of time it lives
4．According to the passage, which of the following inferences is possibly right?
[ ]
A．There is no limit as to how large a warm-blooded animal can be.
B．The humming-bird lives faster than any other warm-blooded animals.
C．Small animals have less skin for their body weight than large ones.
D．The humming-bird is the smallest of the warm-blooded animals.
查看习题详情和答案>>Work your brain!
Between 2 and 3 pounds 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 20 percent of our body's oxygen and 20 percent of its blood. Somewhere within its protein，fat, 100,000 miles of blood vessels and 100 billion 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 intricacies(复杂性)are stunning，far beyond anything most of us can imagine. To keep this work of art as polished(有光泽的) as possible we need to eat right，exercise and keep mentally stimulated(刺激)．
Good nutrition helps brain cells communicate with each other. Exercise stimulates a hormone(荷尔蒙)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，谚语)：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 to ______.
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 5 means ______.
A. interesting B. strange C. significant D. amazing
3. According to the text，more exercise ______.
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 avoid ______.
A. eating a good lunch B. doing puzzles
C. eating a large supper D. taking aerobic exercise
查看习题详情和答案>>
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