Question: Read the article and select the best answer. Article: Before 1900, many theories existed as to the cause of yellow fever . Some doctors were sure the disease was air-borne; others felt that it was spread from person to person. Dr. Carlos Finlay, a well-known Cuban doctor of that time, had long held the theory that it was caused by the bite of mosquitoes. But neither the public nor the doctors then accepted his idea. Walter Reed,all American doctor sent to study yellow fever in Cuba,went to talk with Finlay.Reed,after reading a lot on the subject,had begun to think that Dr.Finlay might be fight.Then Reed and his comrades set to work at once.Outside Havana,they set up a laboratory and began experiments to test the theory.The experiments were successful.Now we know:A period of about two weeks must pass before a mosquito,after feeding on a sick person,could infect another person.The sick person had to have yellow fever a certain number of days before the mosquito biting him was able to carry the disease. Question: One will come down with yellow fever if he has been bitten by _ . Options: A: a mosquito B: an infected mosquito C: a mosquito that has bitten the patient D: a mosquito that has bitten the patient for some days
Answer: D

Question: Read the article and select the best answer. Article: Parents whose children think the latest Nike or Adidas shoes may be better than buying old-fashioned plimsolls because they encourage a healthier style of running, researchers said. Big companies, like Nike and Adidas, make millions of dollars from selling highly-cushioned shoes both as fashion and sports shoes. The researchers warn that wearing such shoes from an early age can make it difficult to run in a healthy way. Once we have grown used to running in this kind of shoes, it is very difficult to change our technique, even if we remove our shoes, it can raise the risk of injury. Children should be encouraged to wear shoes with thin soles such as plimsolls from a young age to help them develop a natural "barefoot" running style, experts said. Dr Mick Wilknson, who did the research, told the British Science Festival in Newcastle, "If I would advise someone on what to give their child, I would say don't go and buy them expensive Adidas or Nike, just get them a pair of flexible, flat shoes. Give them basic foot-ware, nothing fancy, nothing particularly cushioned." Running in flat shoes, barefoot, encourages the runner to use the front of their foot which is a better technique for running, especially long distances as the human was designed to do. Around the world, and in particular in the US, running barefoot is becoming more and more popular with many long distance runners training without shoes. Dr Mick Wilknson believes that training and running barefoot or in flat running shoes can help reduce injuries to runners, he said: "Injury rates in running have not changed since the 1970s, despite claims of improvements in running shoes. That has led some to conclude that barefoot running is better." Question: Why are people advised to wear plimsolls? Options: A: They have a new fashion B: They have better quality. C: They are healthier D: They are cheaper.
Answer: C

Question: Read the article and select the best answer. Article: Singles' Day ---- the Chinese opposite of Valentine's Day has turned into a massive online shopping event. It is a day when single people are supposed to buy themselves presents. But there are sociological reasons behind China's "celebration" of single life. And the imbalance could have big consequences for the country. There were 34 million more men than women in China in 2011. Part of that is natural - usually there are 105 boys born for every 100 girls. But the Chinese gender ratio at birth is much more obvious. It was 116 boys to 100 girls in 2012. The one child policy is largely to blame. Brought in to limit population expansion, the policy allows only one child per family. But because male children are seen as more valuable, as well as more likely to support their parents in old age, some parents choose to have a son over a daughter. The result is that large numbers of men will likely never get married. In fact, one study has predicted that by 2030, 1 in 5 Chinese men in their 30s will never have married, while another states that 94% of unmarried people in China are men. Traditionally, China has seen high levels of marriage, usually among the young. Besides, the increased education and career opportunities for women have meant that marriages are happening later. It is also traditional that women often marry men of a higher socioeconomic status than themselves. So women at the top and men at the bottom find themselves alone. One study has even suggested a link between an imbalanced gender ratio and growth in violent crime in the country. Singles' Day can't solve all the problems China's singles face. Indeed, it is possible that it is causing even more problems, as men resort to increasingly risky lines of work to increase their chances of gaining money and thus a wife. I am worried that as money starts to overcome romance, there is evidence that China's marriage market is increasingly materialistic. Question: What made women in China get married late? Options: A: Their support of the government's late marriage policy. B: Their higher education level and more work chances. C: That they expect to enjoy their single time when young. D: That there are too many excellent young men to choose from.
Answer:
B