__the help of man­made satellites，we can know...

____ 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 help of man­made satellites，we can know what the weather will be like in the next few days.

A.On B.With C.Using D.By

九年级英语单选题简单题查看答案及解析

_________ the help of man-made satellites, we can know what the weather will be like

in the next few days.

九年级英语单项填空简单题查看答案及解析

—Do you know what the clothes on the show are made of?

—Waste paper. You see, waste things can ________ to life.

A. bring back　　 B. be brought back　　 C. take away　　 D. be taken away

九年级英语单选题中等难度题查看答案及解析

—People now can know what is happening in the world quickly.

—You’re right.With the help of computers，news can ___every corner of the world.

A．get              B．reach             C．return            D．arrive

九年级英语单项填空中等难度题查看答案及解析

---People now can know what is happening in the world quickly.

---You’re right. With the help of computers, news can _______ every corner of the world.

A. get　　 B. arrive　　 C. return　　 D. reach

九年级英语单选题中等难度题查看答案及解析

--- ________ of them knows the answer. What can we do now?  --- Let’s ask a third boy for help.

A．Both             B．Either            C．Neither           D．None

九年级英语单项填空中等难度题查看答案及解析

— ________of them knows the answer. What can we do now?

— Let’s ask a third boy for help.

A.Both B.Either C.Neither

九年级英语单选题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