Another problem is the strain that a person is subjected to when a rocket leaves the ground. Anything that is not moving tends to resist movement. As the rocket leaves the ground, it pushes upward, and the person is pushed back against the chair. During this thrust, gravity exerts a force on the body equal to nine times its normal force.

Once out of the earth's gravity an astronaut is affected by still another problem—weightlessness. Here, if a pencil drops, it doesn't fall. If a glass of water is turned upside down, the water will not fall out. All of us who are used to gravity expect things to have weightless conditions. Recent long flights have shown that the body needs special exercise in a spaceship.

　　  l. As a rocket leaves the ground, an astronaut experiences a force called——.

　　　　 A. gravity　　　　　　　　   B. a push

  　　   C. downward force　　　　    D. strain

　　 2. The force of gravity an astronaut is subjected to when the rocket leaves the ground is equal to

　　　　 A. 7 times its downward force　　　　　　  B. 5 times its normal force

　　　　 C. 3 times its upward force　　　　　　　　 D. 9 times its normal force

　　 3. Which of the following is not true according to the passage?

　　　　 A. Everything is down to the earth by magnetic force.

　　　　 B. Recent long flights have shown that the body needs special exercise in spaceship.

　　　　 C. A rocket must go at most 2, 500 miles an hour to take anyone beyond the gravity of the earth into space.

　　　　 D. There are many problems connected with space travel.

　　 4. Which is the best title for this passage?

　　　　 A. Weightlessness. Gravity and Strain Are All too Difficult to Understand

　　　　 B. Gravity is the Enemy of Space Travel

　　　　 C. Space Travel Problems

　　　　 D. People Cannot Leave the Earth Because of the Air

There are many problems connected with space travel. The first and greatest of them is gravity (地球引力). If you let your pencil drop to the floor, you can see gravity in action. Everything is down to the earth by magnetic force. The weight of something is another way of describing the amount of force exerted on it by gravity. A rocket must go at least 2, 500 miles an hour to take anyone beyond the gravity of the earth into space.

Another problem is the strain that a person is subjected to when a rocket leaves the ground. Anything that is not moving tends to resist movement. As the rocket leaves the ground, it pushes upward, and the person is pushed back against the chair. During this thrust, gravity exerts a force on the body equal to nine times its normal force.

Once out of the earth's gravity an astronaut is affected by still another problem—weightlessness. Here, if a pencil drops, it doesn't fall. If a glass of water is turned upside down, the water will not fall out. All of us who are used to gravity expect things to have weightless conditions. Recent long flights have shown that the body needs special exercise in a spaceship.

　　  l. As a rocket leaves the ground, an astronaut experiences a force called——.

　　　　 A. gravity　　　　　　　　   B. a push

  　　   C. downward force　　　　    D. strain

　　 2. The force of gravity an astronaut is subjected to when the rocket leaves the ground is equal to

　　　　 A. 7 times its downward force　　　　　　  B. 5 times its normal force

　　　　 C. 3 times its upward force　　　　　　　　 D. 9 times its normal force

　　 3. Which of the following is not true according to the passage?

　　　　 A. Everything is down to the earth by magnetic force.

　　　　 B. Recent long flights have shown that the body needs special exercise in spaceship.

　　　　 C. A rocket must go at most 2, 500 miles an hour to take anyone beyond the gravity of the earth into space.

　　　　 D. There are many problems connected with space travel.

　　 4. Which is the best title for this passage?

　　　　 A. Weightlessness. Gravity and Strain Are All too Difficult to Understand

　　　　 B. Gravity is the Enemy of Space Travel

　　　　 C. Space Travel Problems

　　　　 D. People Cannot Leave the Earth Because of the Air

阅读下面短文．从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。

When my brother and l were growing up, we mowed(割)yards during the summer to earn pocket change．Dad traded our service to neighbors and? ? ? a price they could not refuse. We got $ 10 per yard．I later found out our friends ? ? $20 or more for the same amount of work.

One day we were? ? ? our next-door neighbor’s yard．She always waited until the grass was knee—high to call us over．? ? we had an old lawn mower．This particular hot afternoon, I was finishing up and was tired .I ? ?? the tall grass as a cold drink to cool down.

I was just about to cut off the lawn mower? ? ?? I saw Dad pointing to one lone piece. I thought about the ? ? change l was getting paid for cutting grass so high that it ? ?? broke the mower. I ignored him and kept walking. Dad called me out,“You ? ? a piece.” I frowned, hoping he would let me go home. He kept pointing .So ? , 1 went back to cut that piece of grass. I said to myseIf, “That one piece? doesn’t?? ? ? anyone .Why won’t he just let it? ? ?”

But when I reached adulthood，I understood his?? ? ? : When you’re? running? a business, the work you do ? ? ? much about you If you want to be seen as a businessman with? ? ? ，you? must deliver a quality product .That single piece of grass meant the job was not done.

The ? ? my father taught me stayed with me：if you say you are going to ? ? a job at a certain time，keep your ? ? ．Give your customers the kind of ? ? you would llke t0 receive. It shows how sincere you are and how much ? ? you take in your work.

1.A. kept????????????? ?????????? B. calculated????????????? ?????? C. lowered?? ??????? D.offered

2.A. charged????????????? ??????? B. paid??? ???????? C．afforded??? ????? D.spent

3.A. cleaning????????????? ??????? B. exploring??? ???? C .cutting? ????????? D.searching

4.A. To be honest? ?? B．Worse still??? ??? C．Believe or not??? D .Above? all

5.A .picmred??? ???? B. watered??? ?????? C. planted? ???????? D.enjoyed

6.A. after??? ??????? B．before??? ?????? C .when?? ????????? D.while

7.A .total??? ??????? B .exact??? ???? ??? C .loose???? ??????? D .poor

8.A. hardlv??? ?????? B．almost??? ????? C. never?? ????????? D. merely

9.A．lost??? ??????? B．1eft??? ??????? C．missed?? ??????? D.forgot

10.A. angry??? ????? B．happy??? ?????? C. astonished?? ????? D.stubborn

11.A .attract??? ????? B. hurt??? ???????? C. attack??? ???????? D.comfort

12.A．come??? ????? B. live??? ???????? C .go?? ??????????? D. pass

13.A. action??? ?????? B. instruction??? ?? C. feeling?? ???????? D. message

14.A. says??? ??????? B. expresses??? ??? C. explains?? ??????? D.knows

15.A.fortune?? ?????? B. pleasure?? ????? C. content?? ???????? D .honesty

16.A.lesson?? ??????? B．experience?? ?? C. skill?? ?????????? D. business

17.A. quit?? ????????? B .find?? ???????? C. create?? ? ??????? D．perform

18.A．word?? ??????? B. secret? ???????? C. mind?? ????????? D. watch

19.A. dignity? ???????? B．service? ????? C .reward?? ???????? D. praise

20.A．trouble? ??????? B.surprise? ?????? C．pride? ????????? D .responsibility

I found the imagination of becoming a grandmother somewhat discouraging. I was younger than I thought a grandmother should be when I got the news that I was going to become one myself. I admit, it was not a role that I was emotionally ready to accept. I had been a young mother, and had certainly hoped my daughter would not face that same challenge. I remarried when she was a teenager, and then had two more children. On getting the news that she was expecting, I remember thinking “What do I know about being a grandmother? —I haven’t even finished raising my own kids yet!” I don^’t like to be unprepared, so I read a few books about grandparenting. That gave me a little help, but I was still uncertain. I thought about other grandmothers I knew, and got a few ideas I liked and a few more that I didn't. But I couldn't quite figure out what kind of grandmother I wanted to be. Then I thought about my own grandmother, Granny, as she’s known by most people, and I knew I had the answer.

I didn’t realize it until that moment, but my own grandmother was the example for the kind of grandmother I wanted to be. I am fortunate that I got to spend a lot of time with my grandparents when I was a little kid. Here's what I learned from my Granny：

Grandmothers always have a cookie jar. For my entire life, Granny always had a cookie jar full of cookies. When I was a little tiny girl, just at eye level with the counter, Granny would get the cookie jar down for me. When I was a little older I learned how to pull the chair over so I could reach. As I got taller, if I really stretched, I could reach the cookie jar with my finger tips and move it close enough to get it down off the counter to find out what kind of treat was inside. Always the first thing I did when I went to Granny 's house was check the cookie jar and there were always cookies in it. Many years later, I’ll drive my own children to Granny’s house and the first thing Pd do is get us all a cookie.

So grandmothers must have a cookie jar and on my granddaughte’ s first Christmas, my daughter bought me my own cookie jar. She said when they came to see me, her daughter would find the treat the way she did and I did.

The writer thought it was a little discouraging to be a grandmother because________.

A.  she was not old enough to be one

B.  she was not emotionally ready to be one

C.  she thought her daughter was too young to be a mother

D.  grandmother should be older than she was

The underlined phrase “that same challenge ” in the first paragraph refers to” ________”

A. taking care of a grandchild  B. taking care of a baby

C. being a young grandmother    D. being a young mother

It can be inferred from the last paragraph that________.

A.  the writer has many happy memories of her grandmother’s cookie jar

B.  the writer always wanted to know what was inside her grandmother’s cookie jar

C.  the writer often drove her grandchildren to see her grandmother’s cookie jar

D.  women   of the writer ‘s age all have a cookie jar for their grandchildren

What kind of grandmother did the writer want to be?

A.  One who has a jar filled with many kinds of cookies for children and herself.

B.  One who grows up with her grandmother's cookie jar with all kinds of cookies.

C.  One who is like her own grandmother with a cookie jar to treat her grandchildren.

D.  One who always makes different kinds of cookies to treat her grandchildren.

Which of the following can be the best title of this text?

A.  Grandmother’s Cookie Jar                 B.Grandmother’s Treat for Children

C.  Grandmothers and Grandchildren          D. Happy Memories of Cookies