单选题
There are some steps you can take yourself to avoid catching a cold. Contrary to popular belief, colds are not caused by exposure to severe weather. Colds are caused by viruses (病毒) harbored in the body, and you're better off out on the ski slopes or even waiting for the bus on a snowy day than you are in a warm room, surrounded by friends, co-workers, or fellow students, who just may be passing the viruses around. If you feel a chill when you're coming down with a cold, you're already sick. A chill is an early symptom: it's the cold that caused the chill, not the other way around. While the virus can spread through droplets (飞沫) propelled into the air when a cold-sufferer coughs or sneezes. Surprisingly, this is not the most common route of transmission, Numerous studies have now shown that the overwhelming majority of colds are "caught" by hand contact, A cold sufferer rubs her nose, thereby transferring the virus to her hand. Then a friend comes to visit. "Don't kiss me," she cautions, so the friend steps back and presses her hand. The friend then wipes her own nose or eye, and several days later is stricken with a cold. Or parents pick up their child's discarded (丢弃的) tissues and carefully throw them away, but fail to wash their hands afterward. Cold viruses also can be transferred to objects—telephones, towels, plates and remain infectious for up to three hours. Frequent hand-washing—on the part of the cold sufferer as well as other members of the house- hold—will minimize the spread of viruses in this way.
单选题
According to the author, we are most likely to catch a cold if we ______. A. attend a party with a lot of people B. stay long hours in the street on a snowy day C. go out on an extremely cold and windy day D. go skiing or skating in the open air
【正确答案】
A
【答案解析】[解析] 由第一段中“...and you're better off out on the ski slopes or even waiting...who just may be passing the virus around.”可以看出：即使呆在温暖的屋子里，很多人在一起也比在雪天里等公共汽车容易感冒，故选A。
单选题
From what the author says, we can infer that "Exposure to severe weather causes colds." is ______. A. only a supposition of doctors B. still the view held by many people C. an out-of-date view of people in the past D. a fact already proven by doctors
【正确答案】
B
【答案解析】[解析] 由第一段第二句“Contrary to popular belief，colds are not caused by exposure to severe weather.”可以看出：和人们普遍认为相反的是，感冒并不是由严寒的天气引起的。由此可以推断出还是有很多人认为感冒是由严寒的天气引起的，故选B。
单选题
To prevent viruses from spreading, we should ______. A. shake hands with our friends instead of kissing them B. never touch the telephones, towels or plates C. often wash our hands D. often rub our noses and eyes
【正确答案】
C
【答案解析】[解析] 由文章最后一句“Frequent hand-washing...will minimize the spread of viruses in this way.”可以看出：经常洗手会很好地防止病毒传播，故选C。
单选题
Man is most likely to be stricken with a cold if ______. A. he often rubs his eyes or nose B. he fails to expose the cold viruses to air C. he visits his friend in a warm room D. he shakes hands with a cold-sufferer
【正确答案】
D
【答案解析】[解析] 由第二段中“Numerous studies have shown that the overwhelming majority of colds are 'caught' by hand contact.”可以看出，研究表明很多感冒是由手接触引起的，故选D。
单选题
The best title for this passage might be ______. A. Colds and Viruses B. Ways to Avoid Colds C. The Spread of Viruses D. Hand Contact and Transmission of Viruses