摘要: The wind blows the clouds the sky. III.单项选择.

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Have you ever hoped a toy balloon? They are very light. But there are much bigger balloons can fly very high up in the sky. They are big enough to carry people. They are called hot-air balloons.

To make a hot-air balloon go up, turn on the burner(燃烧器). That will make the air inside the balloon hotter. Then the balloon will go up.

To make the balloon go down, turn off the burner. The air inside the balloon will get cooler. Then the balloon will go down. Underneath(在….下面) the balloon there is a large basket. That is where the pilot and the passengers go.

The burner is just above the basket. You can stand in the basket and turn the burner on and off. The balloon will go where the wind is blowing the right way! Do you want the balloon to go somewhere special? First make sure the wind is blowing the right way!

People have been flying in hot-air balloons for over two hundred years. Before planes it was the only way of flying. Today people fly in hot-air balloon for fun. Some people like to race hot-air balloons.

1.A hot-air balloon is ____

A.smaller than a toy balloon                 B.bigger than a toy balloon

C.the same as a toy balloon                 D.lighter than a toy balloon

2.Where will you sit if you want to fly in the balloon?

A.Inside the basket                        B.On top of the balloon

C.Under the basket                       D.Inside the balloon

3.You want the balloon to go up. So you will ____

A.jump out of the balloon

B.let the air out of the balloon

C.make the air inside the balloon hotter

D.let the air inside the balloon cool down

4.Now you are high up in the sky. If you want the balloon go down, you will _____

A.make your friends go out of the basket

B.make a hole in the balloon with a knife

C.make the air inside the balloon hotter

D.make the air inside the balloon cooler

5. Now everything is all right! The balloon is flying across the sky. Where are you going?

A.Towards the sun                        B.To the seaside

C.Where the wind blows you.                D.To the nearest mountains

 

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Have you ever hoped a toy balloon? They are very light. But there are much bigger balloons can fly very high up in the sky. They are big enough to carry people. They are called hot-air balloons.
To make a hot-air balloon go up, turn on the burner(燃烧器). That will make the air inside the balloon hotter. Then the balloon will go up.
To make the balloon go down, turn off the burner. The air inside the balloon will get cooler. Then the balloon will go down. Underneath(在….下面) the balloon there is a large basket. That is where the pilot and the passengers go.
The burner is just above the basket. You can stand in the basket and turn the burner on and off. The balloon will go where the wind is blowing the right way! Do you want the balloon to go somewhere special? First make sure the wind is blowing the right way!
People have been flying in hot-air balloons for over two hundred years. Before planes it was the only way of flying. Today people fly in hot-air balloon for fun. Some people like to race hot-air balloons.
【小题1】A hot-air balloon is ____

A.smaller than a toy balloonB.bigger than a toy balloon
C.the same as a toy balloonD.lighter than a toy balloon
【小题2】Where will you sit if you want to fly in the balloon?
A.Inside the basket B.On top of the balloon
C.Under the basketD.Inside the balloon
【小题3】You want the balloon to go up. So you will ____
A.jump out of the balloon
B.let the air out of the balloon
C.make the air inside the balloon hotter
D.let the air inside the balloon cool down
【小题4】Now you are high up in the sky. If you want the balloon go down, you will _____
A.make your friends go out of the basket
B.make a hole in the balloon with a knife
C.make the air inside the balloon hotter
D.make the air inside the balloon cooler
【小题5】 Now everything is all right! The balloon is flying across the sky. Where are you going?
A.Towards the sunB.To the seaside
C.Where the wind blows you.D.To the nearest mountains

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As we all know, the ocean moves. But waves breaking on the beach make the ocean fun. When you stand on the shore and look at the waves, it seems like the water is moving towards you. But the water is not really moving forward. The moving you see is wave energy. And wave energy comes from the wind.
Let’s think about how this works. As wave energy passes through the water, the energy makes particles (粒子) of water move up and down. Just give you an example of a wave passing under a basketball. We put a basketball on the sea. When the wind blows, a wave comes from behind the basketball. The basketball moves up to the top with the wave. Then the wave continues and leaves the basketball behind. The basketball looks lower, but it doesn’t move forward. That’s because the wave energy just moves the water which is under the basketball.
   So why can you see a wave knock you down on the shore?When a wave moves toward the shore, the bottom of the wave slows down because it meets the ocean floor. But the top, which is called crest(浪峰), keeps moving. The different action causes the wave to fall over or break onto the shore. If a wave is very large, it carries a lot of energy when it hits the land. As time goes by, waves can break up and carry away the rocks and other things on the shore. Shorelines are changing all the time because of wave action.
【小题1】______ is really moving forward when you look at the wave.

A.WaterB.The basketballC.Water and wave energyD.Wave energy
【小题2】Match the sentences with the pictures and the right answer.
(1) The basketball moves up to the top with the wave.
(2) The basketball continues and leaves the basketball behind.
(3) When the wind blows, a wave comes from behind the basketball.
A.a—(2) b—(1) c—(3)B.a—(3) b—(1) c—(2)
C.a—(1) b—(3) c—(2)D.a—(3) b—(2) c—(1)
【小题3】Which of the following is NOT true according to the passage?
A.Wave energy comes from the water.
B.Large waves carry plenty of energy.
C.Wave action makes shorelines change all the time.
D.The bottom of the wave is easy to slow down.
【小题4】The underlined word “it” ( Paragraph 3) refers to “________”.
A.particles of waterB.the shoreC.the windD.the bottom of the wave
【小题5】The main idea of this passage is ______.
A.what makes particles of water moveB.how a basketball moves on the ocean
C.how wave energy causes wave actionD.why a wave can knock you down

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