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听力原文:A world-champion body builder has no more muscles than does a 90-pound weakling.

听力原文: A world-champion body builder has no more muscles than does a 90-pound weakling. So what makes him so strong? What other qualities does be need?

Muscles are made of thousands of stringy fibers—a number that is fixed during childhood—which contract when doing work. Strength does not depend on the number of fibers but on the function of their thickness and how many of them contract simultaneously.

Exercise actually damages the muscles. During the recovery stage, the muscle fibers increase in size. Exercise also trains more muscle fibers to work at one time. If a muscle is weak or untrained, for example, only about 10 percent of its fibers will contract, whereas up to 90 percent of the fibers in a weight lifter's bulky biceps will contract.

Aside from strength, two other ingredients go into making an athlete: fitness and endurance. Fitness is related to the condition of the heart. During exercises, there is an increase in the amount of blood returning to the heart from the muscles. A typical volume for a runner at rest is about 5 quarts a minutes, compared with 30 quarts during a vigorous trial. This greater volume means more work for the heart a muscular balloon that expands and contracts to take in blood and squeeze it out. Like any other muscle, the heart enlarges and gets stronger with routine exercise.

Endurance, or the length of time muscles can work, depends in part on how much fuel—in this case sugar—the muscles can store. A muscle that is continually exercised until it is exhausted of sugar tends to store more when it refuels at the next meal. And more sugar can translate into greater endurance the next time the muscle is put to the test.

(33)

A.Because the fibers of his muscles are very thick.

B.Because he has more muscles.

C.Because his muscles are made of more stringy fibers.

D.Because the number of his muscles was fixed during his childhood.

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更多“听力原文:A world-champion body builder has no more muscles than does a 90-pound weakling.”相关的问题

第1题

听力原文:What kind of class went on the field trip?(21)A.Biology.B.Photography.C.Swimming.

听力原文:What kind of class went on the field trip?

(21)

A.Biology.

B.Photography.

C.Swimming.

D.Painting.

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第2题

听力原文:W: Excuse me, Mr. Smith.M: It's okay with me if there is no meeting, but what for

听力原文:W: Excuse me, Mr. Smith.

M: It's okay with me if there is no meeting, but what for?

Q: What is the woman asking for?

(14)

A.Reasons.

B.Advice.

C.Leave.

D.Opinions.

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第3题

听力原文:What is mentioned as a weakness of buses in Beijing?(28)A.Not comfortable.B.Rathe

听力原文:What is mentioned as a weakness of buses in Beijing?

(28)

A.Not comfortable.

B.Rather crowded and slow.

C.Interval is long.

D.Cannot reach suburban areas.

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第4题

听力原文:M: Were those books ordered by Ellinwood or Renter?W: Hardin ordered them.Q: By w

听力原文:M: Were those books ordered by Ellinwood or Renter?

W: Hardin ordered them.

Q: By whom Were the books ordered?

(16)

A.Ellinwood.

B.Reuter.

C.Hardin.

D.The woman.

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第5题

听力原文:What will the students be asked to do in the woman's come?(25)A.Paint a picture.B

听力原文:What will the students be asked to do in the woman's come?

(25)

A.Paint a picture.

B.Take a mid-term exam.

C.Give an oral report.

D.Buy painting tools.

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第6题

听力原文:W: That's a nice computer. Its software is especially wonderful.M: The problem is

听力原文:W: That's a nice computer. Its software is especially wonderful.

M: The problem is how to utilize it.

Q: What are they discussing?

(19)

A.How to buy a good computer.

B.How to borrow a computer from the company.

C.The price of the computer.

D.The newly- bought computer.

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第7题

听力原文:What are the three biggest markets for American agricultural exports?(36)A.Canada

听力原文:What are the three biggest markets for American agricultural exports?

(36)

A.Canada, Japan and Mexico.

B.Canada, Mexico and the European Union.

C.Japan, the European Union and Asia.

D.Japan, Latin America and Asia.

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第8题

听力原文:M: Open wide. Now show me where it hurts.W: Here on the top, especially when I bi

听力原文:M: Open wide. Now show me where it hurts.

W: Here on the top, especially when I bite into something hot or cold.

Q: Who is the man?

(18)

A.A dentist.

B.A cook.

C.A dietician.

D.A twirler.

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