Read the article and select the best answer. Article: China has now mapped out plans for its next four launches in the Shenzhou program on the next flight. But one conclusion seems to have escaped most reports in the aerospace media. The flight of Shenzhou 7 could be timed to coincide with the Beijing Olympics. Plans for the 2008 Summer Olympics call for the events to be held between the 8th and 24th of August. It's reasonable to expect that China will use the event to promote its achievements before the world, and human spaceflight is China's most significant recent breakthrough. Shenzhou 7, China's next manned space mission, was originally advertised for 2007. This fit into the pattern of staging a two-year gap between crewed Shenzhou missions, which have previously launched in 2003 and 2005. But Chinese media statements have recently _ this to 2008. Chinese media have reported that while the overall program is going well, more time is needed to work on the spacesuit that will be used on this flight to stage China's first spacewalk. It's possible that Chinese engineers want to make best preparations for this complex mission. China could intend to carry out the mission of Shenzhou 7 just as media attention is focused on the lead-up to the Olympics. The crew of the flight, and possibly China's other flown astronauts, could then take part in the opening ceremony. China has previously feted her space travellers in great celebrations, such as the Hong Kong event that saw Yang Liwei singing with actor Jacky Chan. China has also suggested that the activity will be carried out by a single astronaut, and has indicated that half an hour is a rough estimate of the planned time for the spacewalk. China is apparently following suit, probably for the same reasons of conservative mission planning and safety. Question: China has decided to carry out its human spaceflight in 2008 in order to _ . Options: A: make the Beijing Olympics more interesting. B: show its great achievements to the world. C: prove that China is a developed country. D: introduce its science and technology to the world.
B

Read the article and select the best answer. Article: Motherhood may make women smarter and may help prevent dementia in old age by bathing the brain in protective hormones ,US researchers reported on Thursday. Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer's . University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans. "Our research shows that the hormones of pregnancy are protecting the brain, including estrogen , which we know has many neuroprotective effects," Kinsley said. "It's rat data but humans are mammals just like these animals are mammals," he added in a telephone interview. "They go through pregnancy and hormonal changes." Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer's and other forms of age related brain decline. "When people think about pregnancy, they think about what happens to babies and the mother from neck down," said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida. "They do not realize that hormones are washing on the brain. If you look at female animals who have never gone through pregnancy, they act differently toward young. But if she goes through pregnancy, she will sacrifice her life for her infant--that is a great change in her behavior that showed in genetic alternations to the brain." Question: How do scientists know that motherhood may make women smarter? Options: A: Many women say so. B: They know it by experimenting on rats. C: They know it through their own experience. D: Some researchers have told them.
B

Read the article and select the best answer. Article: Mr. Brown worked in a factory of a small town. He had been there for twenty years before one day he was sent to the capital for important business. He was quite excited because he had never been there before. Before he set off, he asked his wife and three daughters if they wanted him to buy something for them in London. Mrs. Brown began to think it over and then she said she wished her husband would be able to buy a nice umbrella for her, and so did their three daughters. As he was afraid he would forget it, he drew an umbrella on his hand. To his regret, he lost _ at the station. On the train Mr. Brown sat opposite to an old woman. The woman's umbrella was so nice that he carefully looked at it and said to himself not to forget to buy a few umbrellas like it. When the train arrived at the station in London, he said good-bye to the old woman, took his bag and her umbrella and was going to get off. "Wait a minute, sir," shouted the old woman. "That's my umbrella!" Now Mr. Brown noticed that he had taken her umbrella. His face turned red at once and said in a hurry,"Oh, I'm very sorry, Madam! I didn't mean it!" Seven days later Mr. Brown left the capital. To his surprise, he met the old woman and sat opposite to her again. Looking at the four umbrellas, the old woman was satisfied with herself. "It seems that I had a better choice than the other four women." She thought. Question: We can learn from the passage that Mr. Brown was _ . Options: A: a conductor B: a thief C: a worker D: an umbrella maker
C