1 . 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.
1. What does the underlined word “them” refer to?| A．Alyssa’s family. | B．Alyssa’s classmates. | C．The characters in the cartoon. |
| 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. |
| 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. |
| 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. |
| 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. |
Do you know anything about the Moon?
Scientists have told us so much about the Moon.
The Moon is an unfriendly place.
But from the Moon, you can see our beautiful Earth. It is shining more brightly than the other stars in the dark.
| 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 easy for us to have the idea of going to the Moon. |
| F．When the Sun shines in the day, the temperature is very high. |
It is said that there has been life on the earth for hundreds of millions of years. Is there life on other planets? The scientists found that n
Many other galaxies are far away from us. Their light has to travel for many years to
What do you know about Mars（火星）? What does it look like?
Mars is the fourth planet from the sun in our solar system（太阳系）and is named after the Roman god of war. Mars goes around the sun at a distance of about 228 million kilometers. You can tell which planet is Mars because it is bright red and looks like a red and orange ball in the night sky. It’s very beautiful. But during spring and summer, the surface of it is covered by strong storms. The gravity（重力）on the surface of Mars is about 2/5 as strong as it is on the earth. So a person who weighs 90 kilos on earth weighs only 36 kilos on Mars. The temperature on Mars is between -138℃ and 28℃. The air has only 0.13% oxygen.
Scientists are still searching for more information about Mars.
1. Who is Mars named after?（根据短文内容回答问题）2. How can you tell which planet is Mars?（根据短文内容回答问题）
3. Why does a person who weighs 90 kilos on the earth weigh only 36 kilos on Mars?
4. In the passage, the underlined word “it” refers to
5. Do you think people may live on Mars in the future? Why?（不超过20个词）
5 . All the planets in the solar system go around the sun. There are eight planets in the solar system. Years ago, there were nine planets. Ever since Pluto (冥王星) was demoted (使降级), we’ve had just eight planets.
Some scientists have studied the farthest reaches（研究）of our solar system. They believe there might be another planet out there. They call it Planet Nine. What would Planet Nine be like? Scientists believe it could be about three times larger and ten times heavier than the earth.
If Planet Nine is out there, why haven’t we found it yet? Scientists are still reaching for it because it’s so far away. They believe it could take Planet Nine as long as 20,000 years to go around the Sun. Scientists also think Planet Nine could be as much as 10,000 times darker than Pluto.
It is very difficult to search for such a dark planet in the whole solar system. Could our solar system have a ninth planet? We hope to know the answer in the near future.
1. From the first paragraph, we can know Pluto .| A．goes around the Earth |
| B．was a planet years ago |
| C．was not demoted |
| A．three times larger than the sun |
| B．out of the solar system |
| C．ten times heavier than the earth |
| A．it’s far and dark |
| B．it doesn’t go around the sun |
| C．it’s large and heavy |
| A．scientists are still reaching for Planet Nine |
| B．it is easy to search for such a dark planet |
| C．our solar system can’t have a ninth planet |
| A．Solar System | B．Dark Pluto | C．Planet Nine |
