30. Heat does not travel by convection in a solid, because the solid does not move, . a. so does a liquid b. so a liquid does c. so is a liquid d. as does a liquid 查看更多

 

题目列表(包括答案和解析)

阅读下列短文,从每题所给的四个选项中选出最佳选项。

  8∶30 PM

  Outlook

  Outlook is back with a new series of reports to keep you up date with all that's new in the world of entertainment.Stories go all the way from the technical to the romantic,from stage to screen.There will be reports of the stars of the moment,the stars of the future and the stars of the past.The director with his new film,the designer with the latest fashion,and the musician with the popular song are part of the new Outlook.The program is introduced by Fran Levine.

  9∶00 PM

  Discovery

  When a 10-year-old boy gets a first class degree in mathematics or an 8-year-old plays chess like a future grade master,they are considered as geniuses.Where does the quality of genius come from?Is it all in the genes(基因)or can any child be turned into a genius?And if parents do have a child who might become a genius in the future,What should thy do?In this 30-minute film,Barry Johnson,the professor at School of Medicine,New York University will help you discover the answer.

  10∶00 PM

  Science/Health

  Is it possible to beat high blood pressure without drugs?The answer is“yes”,according to the researchers at Johns Hopkins and three other medical centers.After a study of 800 persons with high blood pressure,they found that after 6 months,those devoted to weight loss-exercise and eating a low-salt,low-fat food-lost about 13 pounds and became fitter.Plus,35% of them dropped into the“normal”category(范畴).This week,Dr.Alan Duckworth will tell you how these people reduce their blood pressure to a level similar to what's achieved with Hypertension drugs.

1.The main purpose of writing these three texts is________.

[  ]

A.to invite people to see films

B.to invite people to join discussions

C.to attract more students to attend lectures

D.to attract more people to watch TV programs

2.From Outlook,you can get a great deal of information about________.

[  ]

A.story tellers
B.famous stars
C.film companies
D.music fans

3.Who will be most probably interested in Discovery

[  ]

A.Parents who want to send their children to a school of medicine.

B.Children who are good at mathematics.

C.Parents who want their child to become another Albert Einstein.

D.Children who are interested in playing chess.

4.In Science/Health,“Johns Hopkins”is________.

[  ]

A.a famous university
B.a medical center
C.a well-known doctor
D.a drug company

5.According to the third text,which of the following has almost the same effect as Hypertension drugs?

[  ]

A.Exercise plus a healthy diet.

B.Loss of thirteen pounds in weight.

C.Six months of exercise without drugs.

D.Low-salt and low-fat food.

查看答案和解析>>

听下面5段对话。每段对话后有一个小题,从题后所给的ABC三个选项中选出最佳选项,并标在试卷的相应位置上,每段对话仅读一遍。

1. How much time does the man spend traveling to work?

A. 15 minutes.      B. 30 minutes.     C. 45 minutes.

2. Where did the conversation most probably take place?

A. In the office.

B. At the gas station.

C. In the street.

3. What is the man?

A. A taxi driver.     B. A waiter.     C. A conductor.

4. How does the woman feel?

A. Satisfies.      B. Discouraged.      C. Happy.

5. At what time will they most probably meet?

A. At 10:00.      B. At 1:00.      C. At 11:00.

 

查看答案和解析>>

阅读理解

  8:30 PM

  Outlook

  Outlook is back with a new series of reports to keep you up date with all that's new in the world of entertainment. Stories go all the way from the technical to the romantic, from stage to screen. There will be reports of the stars of the moment, the stars of the future and the stars of the past. The director with his new film, the designer with the latest fashion and the musician with the popular song are part of the new Outlook. The program is introduced by Fran Levine.

  9:00 PM

  Discovery

  When a 10-year-old boy gets a first class degree in mathematics or an 8-year-old plays chess like a future grand master, they are considered as geniuses. Where does the quality of genius come from? Is it all in the genes(基因)or can any child be turned into a genius? And if parents do have a child who might become a genius in the future, what should they do? In this 30 minute film, Barry Johnson, the professor at School of Medicine, New York University will help you discover the answer.

  10:00 PM

  Science/Health

  Is it possible to beat high blood pressure without drugs? The answer is“yes”, according to the researchers at Johns Hopkins and three other medical centers. After a study of 800 persons with high blood pressure, they found that after 6 months, those devoted to weight loss——exercise and eating a low-salt, low-fat food——lost about 13 pounds and became fitter. Plus, 35% of them dropped into the“normal”category(范畴). This week, Dr. Alan Duckworth will tell you how these people reduce their blood pressure to a level similar to what's achieved with Hypertension drugs.

(1)The main purpose of writing these three texts is ________.

[  ]

A.to invite people to see films

B.to invite people to topic discussions

C.to attract more students to attend lectures

D.to attract more people to watch TV programs

(2)From Outlook, you can get a great deal of information about ________.

[  ]

A.story tellers     B.famous stars

C.film companies    D.music fans

(3)Who will be most probably interested in Discovery?

[  ]

A.Parents who want to send their children to a school of medicine.

B.Children who are good at mathematics.

C.Parents who want their child to become another Albert Einstein.

D.Children who are interested in playing chess.

(4)In Science/Health,“Johns Hopkins”is ________.

[  ]

A.a famous university

B.a medical center

C.a well-known doctor

D.a drug company

(5)According to the third text, which of the following has almost the same effect as Hypertension drug?

[  ]

A.Exercise plus a healthy diet.

B.Loss of thirteen pounds in weight.

C.Six months of exercise without drugs.

D.Low-salt and low-fat food.

查看答案和解析>>

Remember what weight is? Weight is the gravitational pull on an object. If, somehow, the pull of gravitation changes, then the weight of the object changes. The mass of the object, the amount(数量)of matter it is made of, does not change.

If a bag of sugar weighs 6 kilograms on earth, what will it weigh on the moon? It will weigh one kilogram on the moon, 1/6 of its weight on the earth.

Here on the earth we usually talks as if weight and mass were the same thing. We use weight as a way of measuring mass. On the earth this is very convenient. A mass of sugar that weighs 6 kilograms in California will weigh about 6 kilograms in Hawaii or Canada or Germany. Because the force of gravitation in each place is practically the same.

As long as we stay on earth, using weight to measure mass works pretty well. Now, however, men have left the earth. Suddenly we realize that weight and mass are not the same thing! Away from the earth the force of gravitation changes. As the pull gravitation changes, weight changes, but the mass of an object stays the same anywhere in the universewhether it is on earth, on the moon, or on Mars.

Have you ever wondered why the pull of gravitation on the moon is only 1/6 of the pull on the earth? Here is a reason. When the mass is less, gravitation is less. The moon has less mass than the earth. Since the moon has much less mass than the earth, it has much less gravitational force than the earth.

1.Which of the following is NOT true?

A. Few people on the earth would pay much attention to the difference between weight and mass.

B.The weight of an object hardly changes wherever on the earth it is weighed.

C.The weight of an object becomes less on the moon because the moon is far away from the earth.

D.Mass is a concept(概念)more important than weight in the study of the universe.

2.The amount of mass depends on     .

A. the weight of an object?               B.the place where it is measured

C.the size of an object?                  D.the amount of matter it is made of

3.An astronaut, who weighed 30 pounds on the moon, is back on earth and now weighs 165 pounds. How much weight did he lose during his flight back to the earth?

A.115 pounds.         B.2.5 pounds.?        C.30 pounds.          D.15 pounds.

4.We can infer from the passage that the word Mars means     .

A. a faraway place on the earth

B.a place deep down in the ocean

C.a kind of flying equipment like a spaceship

D.a planet which is farther away from the earth than the moon is

 

查看答案和解析>>

Remember what weight is? Weight is the gravitational pull on an object. If, somehow, the pull of gravitation changes, then the weight of the object changes. The mass of the object, the amount(数量)of matter it is made of, does not change.

If a bag of sugar weighs 6 kilograms on earth, what will it weigh on the moon? It will weigh one kilogram on the moon, 1/6 of its weight on the earth.

Here on the earth we usually talks as if weight and mass were the same thing. We use weight as a way of measuring mass. On the earth this is very convenient. A mass of sugar that weighs 6 kilograms in California will weigh about 6 kilograms in Hawaii or Canada or Germany. Because the force of gravitation in each place is practically the same.

As long as we stay on earth, using weight to measure mass works pretty well. Now, however, men have left the earth. Suddenly we realize that weight and mass are not the same thing! Away from the earth the force of gravitation changes. As the pull gravitation changes, weight changes, but the mass of an object stays the same anywhere in the universewhether it is on earth, on the moon, or on Mars.

Have you ever wondered why the pull of gravitation on the moon is only 1/6 of the pull on the earth? Here is a reason. When the mass is less, gravitation is less. The moon has less mass than the earth. Since the moon has much less mass than the earth, it has much less gravitational force than the earth.

1.Which of the following is NOT true?

A. Few people on the earth would pay much attention to the difference between weight and mass.

B.The weight of an object hardly changes wherever on the earth it is weighed.

C.The weight of an object becomes less on the moon because the moon is far away from the earth.

D.Mass is a concept(概念)more important than weight in the study of the universe.

2.The amount of mass depends on     .

A. the weight of an object?               B.the place where it is measured

C.the size of an object?                  D.the amount of matter it is made of

3.An astronaut, who weighed 30 pounds on the moon, is back on earth and now weighs 165 pounds. How much weight did he lose during his flight back to the earth?

A.115 pounds.         B.2.5 pounds.?        C.30 pounds.          D.15 pounds.

4.We can infer from the passage that the word Mars means     .

A. a faraway place on the earth

B.a place deep down in the ocean

C.a kind of flying equipment like a spaceship

D.a planet which is farther away from the earth than the moon is

 

查看答案和解析>>


同步练习册答案