试题详情
阅读理解-单选 适中0.65 引用1 组卷42

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, the 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 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!
【小题1】On a clear, dark night, our eves can see ________ stars in the sky.
A.less than 6,000B.more than 6,000
C.around 6,000D.not mentioned in the article
【小题2】According to the article, most stars are shining with a ________ light.
A.fixedB.colourfulC.brightD.flashing
【小题3】What makes stars seem to twinkle?
A.Air on Earth.
B.The movement of air in the atmosphere of Earth.
C.The long distance between stars and Earth.
D.The movement of stars.
【小题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.
【小题5】Which is the best title of this passage?
A.What do stars look like?B.Which song do children like best?
C.How to observe the stars from Earth?D.Why are many stars so dim at night?
20-21九年级下·山东济南·开学考试
知识点:天体与宇宙科普知识说明文 答案解析 【答案】很抱歉,登录后才可免费查看答案和解析!
类题推荐

Alysaa Carson is a 17-year-old girl. She dreams of going to Mars. She was first interested in becoming an astronaut at the age of three. At that time, she was watching a cartoon called The Backyardigans. The characters in the cartoon went to Mars many times for different tasks. She also wanted to be one of them.

After knowing the serious pollution and the large population on Earth. Alyssa thinks people may look for another planet to live on in the future. She thinks humans may choose to live on Mars in the future. That’s because it’s a planet similar to the earth in some aspects (方面). What’s more, people will be able to use the technologies to get there at that time. Alyssa dreams of going to Mars and working in the field of astrobiology (天体生物学).

Her father believes that parents should help children achieve their dreams. He thinks that it doesn’t matter if the dreams change a lot or how crazy they are. And he doesn’t think it’s too young to get a pilot’s license (执照) for a 17-year-old girl. Perhaps it’s very dangerous for his daughter to go to Mars. But he believes that she can achieve her dream one day. What he can do is to let his daughter work hard for her dream.

【小题1】What does the underlined word “them” refer to?
A.Alyssa’s family.B.Alyssa’s classmates.C.The characters in the cartoon.
【小题2】Why does Alyssa think people should go to Mars?
A.Because people can live a happier life there.
B.Because mars has something in common with the earth.
C.Because it’s a planet with many new lives.
【小题3】What can we learn about Alyssa Carson’s father?
A.He respects his daughter’s dream.
B.He used to be a pilot when he was young.
C.He works in the field of astrobiology now.
【小题4】Which one is TRUE according to the text?
A.It’s easy for a 17-year-old girl to get a pilot’s license.
B.Alyssa’s dream of going to Mars lasts for a long time.
C.We can ask parents for help when we meet trouble.
【小题5】What does the writer want to tell us?
A.Interest is the best teacher for every child.
B.It’s never too late for people to learn something new.
C.Parents should work hard for their children’s dreams.

Wang Yaping, together with Zhai Zhigang and Ye Guangfu, went into space aboard the Shenzhou XIII on October 16th last year. And now they are preparing for their return trip in the middle of April, 2022. The 41-year-old Wang became the first female astronaut (女航天员) to enter Tiangong space station. She also became a space teacher and gave two lessons to students on Earth.

Wang’s space dream started in 2003, when China sent its first astronaut Yang Liwei into space. At that time, Wang was a pilot in the Chinese army. After having safe flights for 1,600 hours over nine years, Wang was a strong candidate to become an astronaut in 2010. She pushed herself hard, getting the same training as men. “The space environment won’t change because you are a woman,” she told Xinhua.

The hardest part is the high-G training. Sitting in a spinning (旋转的) machine, Wang would become blind for a while because her brain was short of blood. “There’s a red button (按钮),” said Wang. “If you can’t bear it, you can press it to stop.” But Wang never used it. “There is no such red button in my heart.” That strong spirit finally made her dream come true in 2013. She joined the team for the Shenzhou X mission.

Wang said that as astronauts, women have their own advantages. “Women may be more patient and can better deal with loneliness. Women’s hearts are also easier to adapt (适应) to the weightless environment, making them more suitable for long-term missions.”

Wang Yaping went a long way before becoming the first woman to enter the Tiangong space station. She sets a good example for all women who dream of going to space.

【小题1】How long will the three astronauts stay in space?
A.Four months.B.Five months.C.Six months.D.Eight months.
【小题2】What does the underlined sentence mean in Paragraph 2?
A.Only men can go to space.
B.The space environment is easy to change.
C.Both male and female astronauts can go to space.
D.Men and women will face the same difficulties in space.
【小题3】Why would people become blind for minutes while sitting in a spinning machine?
A.Because the machine worked loudly.B.Because their brains were short of blood.
C.Because some people trained less.D.Because there were the same difficulties in space.
【小题4】What can we learn from Wang’s story?
A.Never too old to learn.B.Well begun is half done.
C.Old habits die hard.D.Nothing is difficult if you put your heart into it.
The solar system has eight planets. The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The Planets are all round, like balls. The planets all go around the sun.
Mercury is the closest to the sun. It is very hot on Mercury. The planets that are far away from the sun are very cold. Venus is between Mercury and the Earth. It is sometimes called Earth’s “sister planet” because they have almost the same size and shape. The Earth is the planet where we live. From space, the Earth looks blue because it has so much water. Jupiter is the largest planet in our solar system. Saturn is known for having rings around it. Uranus was the first planet discovered with a telescope. We can see Venus, Mars, Jupiter, and Saturn with our eyes, however, to see Uranus, we need a telescope. Neptune is the 8th planet in our solar system. The planet is farthest from the sun.
Probes (探测仪) go into space and take pictures of the planets. We learn a lot from these pictures. If you could send a probe to any planet, where would you send it?
【小题1】What goes around the sun?
A.Moon.B.Stars.C.Spaceships.D.Planets.
【小题2】Which planet is Earth’s “sister planet”?
A.Mercury.B.Venus.C.Jupiter.D.Saturn.
【小题3】Some planets are far away from the sun so they are very ______.
A.coldB.hotC.smallD.bright
【小题4】What does the underlined word “telescope” mean in Chinese?
A.潜水镜B.显微镜C.高台D.望远镜
【小题5】Which of the following is TRUE?
A.Earth is the second closest planet to the sun.
B.Jupiter is larger than any other planet in our solar system.
C.Uranus is famous for having rings around it.
D.We can’t see Mars with our eyes.

组卷网是一个信息分享及获取的平台,不能确保所有知识产权权属清晰,如您发现相关试题侵犯您的合法权益,请联系组卷网