【文章內容簡介】 33 cm. Greyhounds e in a variety of colors. Grey and yellowishbrown are the most mon. Others include black, white, blue, red and brown or a mix of these.Greyhounds have smooth body coats, low body fat and are very healthy. Because they’re slim. They don’t have the leg problems like other dogs the same height. But they do feel the cold, especially since they would much rather be at home in bed than walking around outside.28. The main purpose of the passage is to______.A. tell people two misunderstandings about greyhounds.B. explain why greyhounds are aggressive.C. let people know more about greyhounds.D. describe greyhounds of different colors.29. What can we infer from the passage?A. People love greyhounds because of its aggression.B. Greyhounds need some exercise outdoors.C. Greyhounds like staying in bed all day.D. People consider greyhounds as the best guard dogs.30. Why does the author say that greyhounds make great pets?A. They are big in size. B. They live a very long . They can run races for some time. D. They are quiet and easy to look after.31. According to Para. 4, if you keep a pet greyhound, it is important _____________.A. to take special care of its legs B. to take it to animal doctors regularlyC. to keep it warm D. to keep it slim DFrom the first use of the rocket to carry satellites into space to the setting up of space stations, human beings have been putting great effort into space research. And so far, we have achieved many successes. But there are still numerous tasks in front of us and we should not stop trying to progress.The international space station (ISS) is an important step we should take in space exploration. It is not only helpful but also essential. It provides a proper space environment for many experiments that we have wanted to do for a long time. It is also a base for the observations of the earth and the universe. It could also be an important base for later travel to the moon and Mars. In a word, if we want to explore space more, the first thing we should do is to set up a space station.As the space station costs a lot of money, it is hard for one country alone to establish one. The USA seem to be the only country that has the ability to build a space station alone, and it has tried to do so, but not very successful. So it aggregated many other countries to work on it together. Though it is still extremely expensive, it is much cheaper than doing it alone. It is really a job that needs everyone’s effort and will benefit everyone.Led by the . and Russia, the ISS is a joint project between six space agencies involving 16 countries. Called the greatest achievement in human cooperation, the ISS has e to the end of a tenyear’s hard work in construction. China has applied for participation inthe project many times. Unfortunately all the applications were rejected, which drove China onto the path of independent development. As the Long March ⅡF/T1 carrier rocket blasted offand successfully carried the Tiangong1 into space on September 29, 2011, China takes a big step toward its Space Station Era.Some West media suggested that the successful launch of Tiangong1 would disturb the balance of global space power, raising concerns about “China threat”. China’s space project is not designed for military purpose but for developing space technology to explore space resources and make use of them for mankind’s wellbeing.32. From Paragraph 2 we learn that ________.A. the necessity of building the international space station is not realized nowB. many experiments have been done in the international space stationC. people have traveled to Mars from the international space stationD. the international space