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题型:阅读理解-单选 难度:0.65 引用次数:54 题号:19358674

“Twinkle Twinkle Little Star” is a popular song for children. But have you ever wondered why the stars twinkle? I’m afraid many adults don’t understand this question, let’s unlock the mystery of the stars!

When we look up to the sky on a clear, dark night, our eyes can see about 6,000 stars in the sky. Some stars look like they are always twinkling and winkling. They are very beautiful. In fact, most of the stars are shining with a steady (稳定的) light. Not all stars twinkle. The stars that twinkle are generally stars. In addition to the Sun, the nearest star to the Earth, the neighboring star (比邻星), is also more than 4 light years away from Earth. Because the distance is too far, the stars we see are only a small point. Also, from the distant star travels a long way through the atmosphere (大气) down to us on Earth. At the same time, air is moving in the atmosphere of Earth. The movement of air causes the starlight to get slightly bent. To our eyes, this makes the star to twinkle. You will notice that stars closer to the horizon appear to twinkle more than other stars. This is because there is more atmosphere between you and a star near the horizon. However, there is no atmosphere in space to make the stars seem to twinkle. That’s why the Hubble telescope (哈勃望远镜), which is in space, can take such clear pictures of other galaxies (星系).

Go out tonight and take a look at the stars twinkling in the sky!

1. On a clear, dark night, our eyes can see _________ stars in the sky.
A.less than 6,000B.around 6,000C.more than 6,000D.Not mentioned in the article
2. According to the article, most stars are shining with a light __________.
A.brightB.colourfulC.fixedD.flashing
3. What makes stars seem to twinkle?
A.The movement of air in the atmosphere of Earth.
B.Air on Earth.
C.The long distance between stars and Earth.
D.The movement of stars.
4. Why can the Hubble telescope take clear pictures of other galaxies?
A.Because stars twinkle in space.B.Because air is not moving in space.
C.Because the telescope is close to stars.D.Because there is no atmosphere in space.
5. Which is the best title of this passage?
A.Why are many stars so dim at night?B.Which song do children like best?
C.How to observe the stars from Earth?D.What do stars look like?

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【推荐1】Do stars only appear at night? The answer is no. Venus(金星)is the one and only star that can be seen in the daytime. It shone at its brightest in the night sky on February 17, 2017.

Venus is the second planet in order from the sun. It is the second brightest natural object(物体), behind the moon, in the night sky. Why is it so bright? First of all, Venus is the closest planet to the earth. It is also covered by highly reflective(反射的)clouds, which can reflect about 70 percent of the sunlight shining it, almost twice as much as the earth doe.

Some people called 2017 the year of Venus, because the planet was at its brightest twice in the year. Venus gets brighter when it goes further away from the sun, and nearer to the earth. The brightest moment happened once in February, and happened again during daylight on April 30th.

Venus is closer to the earth than Mars and it’s closer to the earth in size. Isn’t it a better choice for human exploration(探索)than Mars? However, with a temperature of about 465℃ on the surface, Venus is the hottest planet in our solar system! So people haven’t explored Venus yet. But scientists never give up. Recently, a team of NASA and Russian scientists created a new computer equipment that can stand temperatures of 480℃. It can work under Venus-like conditions for almost 22 days. The next step, according to the scientists, is to send a probe(探测器)to Venus by 2025.

1. Which of the following is not true about Venus?
A.It is the second planet in order from the sun.B.It once shone at its brightest in the night sky.
C.It is the one and only star that can be seen in daytime.D.It is the second brightest natural object behind the earth.
2. Venus is so bright because ________.
a. it can reflect about 70 percent of the sunlight
b. it is covered by highly reflective clouds
c. It is the closest planet to the earth
A.a, bB.b , cC.a, cD.a, b, c
3. Why haven’t people explored Venus yet?
A.Because it’s closer to the sun.B.Because it’s closer to the earth in size.
C.Because it’s the hottest planet in solar system.D.Because it’s closer to the earth than Mars.
4. According to the passage, the new computer equipment ________.
A.is a useful probe
B.can stand temperatures above 480℃
C.can work under Venus-like conditions for about 22 days
D.is created only by Russian scientists
5. Where can we probably find this passage?
A.In a science magazine.B.In a travel guide.C.In a novel.D.In a short story.
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【推荐2】请认真阅读下面短文,从短文后的选项中选出能填入空白处的最佳选项,并在答题卡上将该项涂黑。选项中有两项为多余选项。

Do you know anything about the Moon?     1     Do you want to go there?

Scientists have told us so much about the Moon.

The Moon is an unfriendly place.     2     There are only lots of dust and mountains around on it. So there are no animals or plants there. The temperature of the Moon is different from day to night.

    3     However, it’s very cold at night.

    4     As we know, sound can only travel in the air but there is no air on the Moon. As a result, people can’t hear any sounds on it.

But from the Moon, you can see our beautiful Earth. It is shining more brightly than the other stars in the dark.     5     The photos would be wonderful.

A.There is no air or water.
B.How much do you know about it?
C.The Moon is also a very quiet world.
D.You can take some photos with your camera.
E.It’s meaningless for us to have the idea of going to the Moon.
F.When the Sun shines in the day, the temperature is very high.
G.It’s hard for us to live on the Moon.
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【推荐3】A question has made the public think a lot for more than a century: Whether(是否) there is life on Mars.

A British spaceship and Europe’s Mars spaceship plan to land on Mars or enter the orbit(轨道) around it. One of the NASA’s spaceships is going to land on January 3, and the other is going to land on the opposite side of Mars on January 24.

Since 1960, over twenty spaceships sent to Mars have failed. Most were lost when they started flying up or landing because those were the most difficult time of any flights.

Scientists wanted to find out whether there was water on Mars. In October, a team of scientists reported that Mars was a dry wasteland(荒地). But weeks later, a second team reported differently that they had found some marks(痕迹). They showed clearly that they were made by the rivers. Such marks told us that Mars was a warmer place billions of years ago—just as life first appeared on Earth. Scientists at once asked the following questions: If it was true, what happened on Mars? Then what about the earth?

Maybe one day, in the near future, human beings will land on Mars, settle on Mars, and directly look for life.

1. What are people talking about for more than a century?
A.When Mars came into being.B.Whether there is life on Mars.
C.Whether people can live on Mars.D.How people can fly to Mars.
2. Two NASA’s spaceships ________.
A.will land on the different sides of MarsB.will land on the same day
C.will enter the orbit around MarsD.will land with a man
3. Where do you think this passage may come from?
A.A travel guide.B.A film magazine.C.A music website.D.A science book.
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