The rockets take astronauts and man-made sate...

The rockets take astronauts and man-made satellites into space. The satellites are used for communication, weather monitoring and research. But how do satellites stay up without falling down?

There are two opposite forces (力量) acting on the satellite. One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth. The other force is created by the rotation (旋转) of the satellite around the earth. This force tries to take the satellite away from the earth. With these two forces, the satellite goes round and round. The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away.

Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by, the satellite loses its speed, which makes the gravitational pull stronger than the force pulling it away. This makes the satellite crash (坠落) down to the earth.

1.Which of the following uses of satellites is NOT mentioned?

A. communication

B. monitoring the weather condition

C. doing some research

D. taking pictures

2.The force that pulls the satellite towards the earth is created by ________.

A. the earth

B. the satellite itself

C. the rotation of the satellite

D. the rope

3.Why can’t the satellites fly away?

A. Because of the force from the earth.

B. Because the satellite is too big.

C. Because of the force created by the rotation of the satellite around the earth.

D. Because people on earth have made ropes to tie the satellites tightly.

4.The satellite will finally crashes down to the earth ________.

A. when it flies faster

B. when its speed slows down

C. when people cut the rope

D. when there is no electricity in it

5.Which of the following is TRUE according to the passage?

A. There are four forces acting on the satellite.

B. The force of gravitation makes the satellite go round and round.

C. As time goes by, the satellite will finally fall down.

D. The satellite will stay in space forever.

九年级英语阅读单选中等难度题查看答案及解析

The rockets take astronauts and man-made satellites into space. The satellites are used for communication, weather monitoring and research. But how do satellites stay up without falling down?

There are two opposite forces (力量) acting on the satellite. One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth. The other force is created by the rotation (旋转) of the satellite around the earth. This force tries to take the satellite away from the earth. With these two forces, the satellite goes round and round. The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away.

Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by, the satellite loses its speed, which makes the gravitational pull stronger than the force pulling it away. This makes the satellite crash (坠落) down to the earth.

1.Which of the following uses of satellites is NOT mentioned?

A. communication

B. monitoring the weather condition

C. doing some research

D. taking pictures

2.The force that pulls the satellite towards the earth is created by ________.

A. the earth

B. the satellite itself

C. the rotation of the satellite

D. the rope

3.Why can’t the satellites fly away?

A. Because of the force from the earth.

B. Because the satellite is too big.

C. Because of the force created by the rotation of the satellite around the earth.

D. Because people on earth have made ropes to tie the satellites tightly.

4.The satellite will finally crashes down to the earth ________.

A. when it flies faster

B. when its speed slows down

C. when people cut the rope

D. when there is no electricity in it

5.Which of the following is TRUE according to the passage?

A. There are four forces acting on the satellite.

B. The force of gravitation makes the satellite go round and round.

C. As time goes by, the satellite will finally fall down.

D. The satellite will stay in space forever.

九年级英语阅读理解困难题查看答案及解析

The rockets take astronauts and man-made satellites into space. The satellites are used for communication, weather monitoring and research. But how do satellites stay up without Falling down?

There are two opposite forces acting on the satellite. One of them is the force of gravitation(地心引力), which tries to pull the satellite toward the earth. The other force is created by the rotation (旋转)of the satellite around the earth. This force tries to take the satellite away from the earth. With these two forces, the satellite goes round and round. The gravitational pull of the earth is like a rope which keeps the satellite from flying away.

Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by, the satellite loses its speed, which makes the gravitational pull stronger than the force pulling it away. This makes the satellite crash (坠落)down to the earth.

1.The force that pulls the satellite towards the earth is created by ________.

A. the earth B. the satellite itself

C. the rotation of the satellite D. the rope

2.Why can't the satellites fly away?

A. Because of the force from the earth.

B. Because the satellite is too big.

C. Because of the force created by the rotation of the satellite around the earth.

D. Because people on earth have made ropes to tie the satellites tightly.

3.Which of the following is TRUE according to the passage?

A. There are four forces acting on the satellite.

B. The force of gravitation makes the satellite go round and round.

C. As time goes by, the satellite will finally fall down.

D. The satellite will stay in space forever.

九年级英语阅读单选困难题查看答案及解析

The rockets take astronauts and man-made satellites(卫星)into space. The satellites are used for communication, weather checking and research. But how do satellites stay up without falling down?

There are two opposite forces influencing the satellite. One of them is the force of gravitation(地心引力), which tries to pull the satellite towards the earth and is like a rope which keeps the satellite from flying away. The other force is created by the turning of the satellite around the earth. This force tries to take the satellite away from the earth. With these two forces, the satellite goes round and round.

Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by, the satellite loses its speed, which makes the force pulling it towards the earth stronger than the force pulling it away. This makes the satellite fall down to the earth.

1.Two same forces have an influence on the satellite.

2.The force created by the turning keeps the satellite from flying away.

3.Two opposite forces make the satellite turn round and round.

4.The satellite will stay in space forever.

九年级英语阅读判断中等难度题查看答案及解析

阅读下面的短文,用括号内所给单词的适当形式填空，必要时可加助动词。

The third long March-5 rocket, China's largest carrier rocket was successfully launched (发射) from Wenchang Space Launch Center in Hainan Province on Dec. 27, 2019. The rocket 1.(name) Long March-5 Y3. It left the ground from the launch center at 8:45 pm, carrying the Shijian-20 satellite, the 2.(heavy) and most modern communications satellite of China. About 2,220 seconds later, the satellite was sent into 3.(it) planned orbit(轨道) .

The Long March-5 rocket 4. (make) the first flight on Nov. 3, 2016 from Wenchang. However, the 5.(two) largest rocket, Long March-5 Y2, experienced a failure on July 2,2017. 6. (Compare) with Long March-5 Y2, the new rocket Long March-5 Y3 has shown more than 200 technological improvements.

Qu Yiguang, director of the Long March-5 Y3 research team, said, "Under great pressure, the research team has put all the efforts into the rocket over the past two years. We are very 7. (pride) that we can take part in the development of the Long March-5 rocket, which shows the highest level of China's rocket technology. "After over two years of 8. (silent) in Wenchang, the Chinese welcomed the return of the "king" with excitement.

Since the Long March-1 sent China's frist satellite into space 50 years ago, the Long March series rockets 9. (complete) 323 flights. Over the past years, China's rocket technology has been greatly improved. With the success of the Long March-5 Y3 rocket, China 10.(see) a busy year in space activities next year.

九年级英语语法填空中等难度题查看答案及解析

In 1956, Qian Xuesen suggested setting up a special organization, which later became the leading organization for China's rocket and air travel programs. In June 1964, China successfully created its first medium rocket. Qian also played an important role in developing China's first man­made satellite. On April 24, 1970, "Dongfanghong-I" was successfully sent into the air.

When was China's first medium rocket created?

A.In 1955. B.In 1956. C.In 1964. D.In 1970.

九年级英语阅读单选困难题查看答案及解析

__________ that our country will send another man-made satellite into the sky soon.

A. It’s said　　 B. It has said　　 C. It does say　　 D. It is saying

九年级英语单选题困难题查看答案及解析

____ the help of man-made satellites卫星, we can know what the weather will be like in the future few days.

A. With     B. Under

C. Using    D. By

九年级英语单项填空简单题查看答案及解析

The 52nd and 53rd BDS satellites(北斗导航卫星)were _______into space in Xichang,China in 2019 .

A.given back B.sent up C.shown off D.taken away

九年级英语单选题中等难度题查看答案及解析

Some day you may go to the moon. A tall rocket will take you into space. The rocket flies a long way to a space station. You will stop there for a short time. Then a big spaceship will take you to the moon.

About three days later, the ship slowly goes down and gets to the moon. You are now on the moon, but you can not leave your spaceship. You must put on a space suit for the moon. It is very hot in the day and very cold at night. If you don't wear a space suit, you can't live there. You jump out of the spaceship and begin to walk. The moon is lighter than those on the earth. You jump high in the air every time you take a step.

The moon moves slowly, so one day on the moon is as long as two weeks on the earth and one night is just as long as two weeks on the earth. It never rains on the moon, and everything on the moon is dry. There are no trees or other living things of any kind. There is nothing to do there. The earth is a far better place to live on, but scientists are trying to make the best of the moon.

1.How can you go into space? By ______.

A.plane B.spaceship C.rocket D.space suit

2.How can you get to the moon?

A.By rocket I go into space.

B.It will take me a long time to get to the moon by rocket.

C.The rocket will take me to the space station and by spaceship I will get there.

D.A and C.

3.Which is right?

A.Days are longer but nights are shorter.

B.Days are shorter but nights are longer on the moon.

C.Days are shorter but nights are shorter on the moon.

D.Days are longer and nights are longer on the moon.

4.There is no life on the moon because _______.

A.the moon moves very slowly B.there is no air or water

C.day is hotter but night is colder D.night is hotter but day is colder

5.On the moon if you are in a space suit you can move _______ than on the earth.

A.more easily B.harder C.more slowly D.more quickly

九年级英语阅读单选中等难度题查看答案及解析