If someone asks you, “
Maybe we can answer some questions now. What is the sky? Where is it? It is all around the world.
| A．The sky is space. |
| B．Is the sky full of air? |
| C．The sky has no colour. |
| D．What colour is the sky? |
| E．There is no air on the Moon. |
相似题推荐
Thousands of years ago, Chinese poet Qu Yuan (about 340-278 BC) wrote the poem Tianwen, meaning Quest for Heavenly Truth. He came up with a series of questions about the sky, stars, nature, myths and the world around us. The poem showed his doubts about traditional ideas and the spirit of finding the truth.
Inspired by the great poet, China has named its upcoming series of planetary exploration missions (行星探测任务) after the poem. The first one in the series-a Mars exploration mission-has been named Tianwen 1, the China National Space Administration (CNSA) said on April 24, China’s Space Day. This shows China’s desire (渴望) to explore the universe and discover its secrets.
China has been making great progress in space exploration. As early as 1970, China launched its first man-made Earth satellite (卫星), becoming the fifth country in the world to launch a man-made satellite independently. Since 2003, China has carried out six Shenzhou manned missions and launched two space labs into Earth’s orbit (轨道). China’s moon exploration missions-the Chang’e series-started in 2007. In December 2018, China became the first country to send the probe (探测器) Chang’e 4 to the moon’s far side, which always faces away from Earth.
The Tianwen series will follow the Shenzhou and Chang’e series and move further into space. The first step is to launch a Mars probe this year, which will mark the start of China’s exploration of the Red Planet. The probe is expected to orbit (绕……轨道运行), land on and explore Mars in one mission. If it succeeds, it will be the first to complete all of these tasks in one mission. The Long March 5 rocket will send the probe to Mars. It will take seven months to reach the planet and land.
After this mission, China plans to visit Mars again in 2028, aiming to collect soil from the surface of the planet and bring it to Earth. Around 2030, China will explore Jupiter and several asteroids (小行星), according to CNSA.
1. How does the passage lead to the topic?| A．By telling a story. | B．By giving an opinion. |
| C．By answering a question. | D．By offering a suggestion. |
| A．China will launch a Mars probe named Long March 5. |
| B．It will be the first mission of the Tianwen series. |
| C．China will launch the probe on Space Day. |
| D．The probe will be launched on a rocket built by another country. |
| A．how China explored the moon | B．how many missions China has completed |
| C．the progress China has made in exploring space | D．the meaning of the name Tianwen |
| A．taking a clear picture of Mars | B．designing a probe |
| C．naming the mission | D．sending a probe to Mars |
| A．It will visit Venus and several asteroids. |
| B．It will collect soil from the surface of the moon. |
| C．It will launch other missions to Mars. |
| D．It will visit all of the planets in the solar system. |
【推荐2】Is there life on Mars (火星) ? We don’t know. We are sure that people on the earth can not live on Mars. Earth people can’t live without oxygen(氧气). There is little oxygen on Mars.
Living on Mars would be like living on a very high mountain. There would be little air. It may be 50℃ at noon and -100℃ at night.
Many people think there may be plants on Mars. We know that Mars has carbon (二氧化碳). This is kind of material (物质) found in all plants and animals on the earth. Mars looks red. In some places, it seems gray. Sometimes the gray color turns gray-green then brown, and then gray again. The gray-green color may be a kind of plant life changing color with seasons.
Will man go to Mars one day? If they do, they will have to take their own oxygen, food , clothing and shelter (住所) with them .
1. Which of the following you are sure doesn’t live on Mars?| A．Life. | B．Man. | C．Plant. | D．Carbon. |
| A．Because there is almost no oxygen. | B．Because it is too hot at noon. |
| C．Because it is too cold at night. | D．Living on Mars is like living on a high mountain. |
| A．Oxygen. | B．Earth. | C．Carbon. | D．Mars. |
| A．Its gray color. | B．Its gray-green color. |
| C．Its brown color. | D．The changing of its colors. |
| A．Some kinds of plants may live on Mars. |
| B．A little Oxygen is on Mars and it is not enough for earth people to live there. |
| C．We can live on Mars with the help of carbon. |
| D．There is always only one season on Mars. |
Why is it called Mars（火星）? Well, Mars is the name of the Roman god of war（罗马战神）. People see the planet（星球）as a symbol of war for thousands of years. It is also known as the Red Planet because of its color. It is red because it’s rich in iron（铁）. Chinese people called it the “fire star” for the same reason.
Scientists was interested in the planet. They first saw Mars in the sky more than 4, 000 years ago. Then, people from all over the world studied the planet. About 200 years ago, scientists started to study pieces of Mars. They broke away and drifted（漂流）through space for millions of years before they got to Earth.
Scientists have learned some things about Mars. For example, Mars is home to a 21-kilometer-tall mountain—the tallest in our solar system（太阳系）. However, Qomolangma, Earth’s highest mountain, is just 9 kilometers tall. Like Earth, Mars has moons. It has two moons named Phobos and Deimos. The Red Planet also has the largest dust storms（沙尘暴）in the solar system. And they can last for months.
Earth is 10 times heavier than Mars. So The Red Planet’s gravity（重力）is only 37 percent as strong as Earth’s, meaning you can jump nearly two times higher on Mars. For the same reason, you are two times heavier on Earth than on Mars.
1. Why does Mars get the name “fire star”?| A．Because it is red. | B．Because it is rich in iron. | C．Because it is the symbol of war. |
| A．Millions of years ago. | B．Over 4, 000 years ago. | C．More than 200 years ago. |
| A．Scientists. | B．Pieces of Mars. | C．Stars. |
| A．the color | B．the weather | C．the size |
| A．Mars has stronger gravity than Earth. |
| B．People are heavier on Mars than on Earth. |
| C．People can jump higher on Mars than on Earth. |
【推荐1】Do you know why different animals or pests(昆虫) have their special colors? Their colors seem to be used mainly to protect themselves.
Some birds like eating locusts(蝗虫)，but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of colors of crops. When crops are green，locusts look green. But as the harvest time comes，locusts change to the same brown colors as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.
If you study the animal life，you will find the main use of colors is to protect themselves. Bears，lions and other animals move quietly through forests. They cannot be easily seen by hunters. This is because they have the colors much like the trees.
Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid when they face danger. While the liquid spreads over(散开)，their enemies cannot find them. And they immediately swim away. So they have lived up to now though they are not strong at all.
1. From the passage，we learn that locusts ________．| A．change their colors to protect themselves |
| B．are dangerous to their enemies |
| C．are easily found by birds |
| D．are small animals |
| A．They have the colors much like the enemies. |
| B．They hide themselves by day and appear at night. |
| C．They run away quickly. |
| D．They have to move quietly. |
| A．they live in forests |
| B．they have the colors much like the trees |
| C．they move quietly |
| D．they like brown and gray colors |
| A．Because they are very big and strong. |
| B．Because the liquid they send out can help them escape from their enemies. |
| C．Because they swim faster than any other fish. |
| D．Because the liquid they send out can kill their enemies. |
| A．Colors of Different Animals and Pests |
| B．The Main Use of Colors for Animals and Pests |
| C．The Change of Colors for Animals and Pests |
| D．Some Animals and Pests |
【推荐2】Sitting for hours at a time is dangerous and can even lead to death. Today, however, many people spend more time sitting than sleeping.
Studies show that all the time spent at the desk, at the computer, or in front of the television is taking years off your life. Ancient (古代的) humans spent their days hunting (打猎), working, and moving from place to place. So being active is what our bodies are designed (设计) for. As a rapid reaction (反应) to this discovery, many people have begun using standing desks. However, this really isn’t an answer to the question.
A standing desk is a desk specially designed for use without a chair. There are many kinds of them, including normal work desks and special standing computer desks. Researchers say that simply standing instead of sitting won’t make your body much better. Standing only costs a few more calories (卡路里) than sitting and places more pressure on your joints (关节) and back. The best way is to actually move around more. Take a walk around the office every half an hour. You can also walk over to your colleagues and talk to them instead of sending emails.
These are just a few ways to start-moving more while at work. Outside of work, of course, be sure to do plenty of exercise.
1. Standing all day is likely ________.| A．help people react quickly |
| B．be bad for people’s joints and back |
| C．make people feel more relaxed |
| A．people who you work with |
| B．people who you live with |
| C．people who you study with |
| A．the best way to exercise |
| B．how to design a standing desk |
| C．we should avoid sitting all day long |
Did you know that a seed (种子) can have its own “ID card (身份证)”? The “card” shows that the seed is at China’s seed bank in Beijing.
A seed’s travel to the seed bank starts with a census (普查). Workers collected more than 139,000 new seeds from all over the country. Then they arrived at the seed bank.
When seeds first come in, each of them get a number for their “physical examination” (检测). For example, workers put all kinds of Job’s tears (薏米) from different farms together. Then they put them into groups according to the seeds’ look or taste.
Next, workers check the seeds to make sure they’re healthy and all the unhealthy ones are given up. With the bad seeds gone, researchers then test the good ones to see how possibly they are to grow. The seed bank has a quick, smart way of doing this: Workers test the seeds and use the information they get to predict (预测) their growth. Workers dry and weigh the best seeds after several tests. Then, they’re stored in a super cold fridge at -18℃.
China’s seed bank keeps all the seed information safe and helps people learn about them. This can help develop new plants that can grow better and deal well with hard environments, which can make sure the food safety of the country.
1. How does the writer lead in the topic?| A．By showing an ID card. | B．By listing numbers. |
| C．By giving an example. | D．By raising a question. |
| A．According to the seeds’ look or taste. | B．According to the seeds’ taste or temperature. |
| C．According to the seeds’ look or birthplace. | D．According to the seeds’ taste or growth. |
①storing ② testing ③ grouping ④ census ⑤ checking
| A．④③②⑤① | B．④③⑤②① | C．④⑤②③① | D．③④⑤②① |
| A．To protect the type of seed. | B．To control the growth of plants. |
| C．To protect our country’s food safety. | D．To help people know about the seeds. |
| A．A travel guide. | B．A health report. | C．A science magazine. | D．A story book. |
