The moon is round and bright on a fine night. But in fact, it isn’t as beautiful as people say in the fairy tales (神话故事).
| A．If you go there by train, it will take you 200 days. |
| B．Moon cakes are usually round. |
| C．There is no air or water on it. |
| D．And there are no flowers or trees, either. |
| E．It’s about 380, 000 kilometers away from the earth. |
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【推荐1】China’s Chang’e 5 mission is the most recent successful lunar sample return mission. On Dec 17, the Chang’e 5 lunar probe（探测器）returned home along with 1.7 kg of lunar rocks and soil.
The main goal of Chang’e 5 was to bring things back. And China’s new samples stand for a fresh start for its lunar research and space exploration.
The samples were collected at Mons Rumker, also known as the Ocean of Storms. The site has never been sampled（取样）before. Samples that were taken by the US previously（以前）are all more than three billion years old, while the Chang’e 5 samples are less than two billion years old. Scientists are now able to study late-stage（后期）volcanic（火山的）activity on the moon. This activity shaped the younger parts of the rocky moon we see today, according to Long Xiao, a scientist at the China University of Geosciences.
The moon’s volcanic history is not the only mystery that Chang’e 5 is going to solve. The mission could also help scientists learn more about the history of the whole solar system（太阳系）. Scientists will check the amount of radioisotopes（同位素）in the samples to accurately（精确地）date（确定年代）them-the radioisotopes decay（衰减）over time.
Dating lunar samples will give us more accurate ages not only for the moon, but also for other planets in the solar system. These planets are often dated by comparing them to similarly aged areas of the moon.
1. What did China’s Chang’e 5 lunar probe bring back?| A．1.7 kg of lunar rocks and soil. | B．1.7 kg of lunar rocks. |
| C．1.7 kg of lunar soil. | D．1.7 kg of lunar water. |
| A．A new start of space travel. | B．A great success. |
| C．A start for its lunar research and space exploration. | D．A victory of getting the new samples. |
| A．At the Mars. | B．At the Ocean of Storms. |
| C．Behind the Mons Rumker. | D．Behind the Ocean of Storms. |
| A．The moon’s volcanic history. | B．The history of the whole solar system. |
| C．The history of the Earth. | D．The moon’s volcanic history and the history of the whole solar system. |
| A．give us more accurate ages for the moon |
| B．give us more accurate ages for other planets in the solar system |
| C．give us more accurate ages both for the moon and for other planets |
| D．give us more accurate ages for the Earth |
After spending years searching for a planet with life, scientists may have found one. In September 2010, a team of US scientists discovered an Earth-sized planet called Gliese 581g. It has a surface temperature neither too hot nor too cold for liquid（液态）water. Scientists think there is a chance that the planet could have life.The planet Gliese 581g goes around a star called Gliese 581, which is about 20 light-years from Earth. That is about 194 trillion（万亿）kilometres －500 million times farther away from us than the moon.
A spacecraft traveling at a one-tenth of the speed of light would reach Gliese 581g within about 220 years. A human can’t live that long, but robotic explorers could make the job easier. However, our fastest spacecraft don’t come anywhere near that one-tenth light-speed mark.
At present, scientists don’t know what the surface might be like on Gliese 581g. What they know is that the planet is at the sight distance from its star to have liquid water. It’s also at the right distance to have an atmosphere that could protect the water if it is on the surface.
Although spacecraft won’t be getting there anytime soon, one way to look for life on Gliese 581g is to turn our radio telescopes（望远镜）towards the planet and search for radiation（放射）. By studying the radiation, scientists would find out about the chemicals（化学物质）around the planet and discover it Gliese 581g has an atmosphere. If it has one, studying the atmosphere would give us a good idea if the planet has life or not. But it’ll probably be many years before we can do this properly.
People have been arguing about whether there is alien life on Gliese 581g. Any discussion about alien life is just guessing at this point, according to its discoverers.
1. What did scientists find in September 2010?
| A．A planet with water. | B．A planet similar to the earth. |
| C．A planet without life. | D．A planet near the earth. |
| A．is at the right distance from its star | B．moves around the earth |
| C．is as far away from us as the moon | D．can be reached in about 220 years |
| A．the possibility of living on Gliese 581g |
| B．the kinds of chemicals around Gliese 581g |
| C．the way of looking for life on Gliese 581g |
| D．the aim of studying the radiation on Gliese 581g |
| A．Gliese 581g, a Likely Living Planet | B．Gliese 581, a Likely Living Planet |
| C．Gliese 581g and Its Star | D．Gliese 581g and Radiation |
【推荐3】Many people know that rubbish is a big problem on the planet Earth. What many people don’t know is that junk（垃圾）has become a problem in outer space too.
According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes （望远镜）. There are also millions of smaller pieces of junk that we can’t see.
Objects, like bits of old space rockets（火箭）or satellites（卫星）, move around the planet at very high speed so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage （损害）the space tool.
To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U.S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.
To reduce additional （额外的）space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth’s atmosphere （大气层）after that time. In the upper parts of the atmosphere, it will burn up.
Many scientists also suggest different ways to clean up space junk. In England, scientists are testing a special net that can be sent into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely dealt with.
“The problem is becoming more challenging because we’re sending more objects into space to help people use their mobile phones and computers,” says Marco Castronuovo, an Italian space researcher.
“The time to act is now. The longer we leave the problem, the bigger it will become,” he says.
1. The underlined word “these” in Paragraph 2 refers to ________.
| A．telescopes | B．problems |
| C．pieces of space junk | D．BBC news reports |
| A．it burns up after it re-enters the atmosphere |
| B．it often stops the view of telescopes on Earth |
| C．it could force new space tools to travel at lower speed |
| D．it may crash into other space tools causing damage or death |
| A．a safe space tool can stay in space for ever |
| B．rubbish as well as space junk used to be a big problem |
| C．scientists have no trouble solving the problem of space junk |
| D．more efforts require to be made to keep outer space safe and clean |
