单选题Our teacher recommend that we ____ as attentive as possible when we visit the museum.

单选题She did not want to share the room with her brother because she could not ______ his bad habits. A. keep up with B. take account of C. stand up to D. put up with

单选题(77) Heredity (遗传) is not the only thing that influences our color. Where we live and how we live after we are born are important too. For instance, our genes influence how fat or thin we are. But our weight depends mainly upon how much we eat and how much exercise we get. In the same way, our skin color depends to a large extent upon how much sunshine we get.When summer arrives and light-colored people go to the beaches, some will tan dark-ly, some will tan lightly and few will not tan at all. Each one has inherited a different abili-ty to tan, but the differences do not appear until the conditions are right. An outdoor man will soon become pale if he changes to an indoor job, while a desk clerk will take on tan after a short vacation in the sun.Sometimes people decide that being tanned is better than being pale. Sometimes they decide the opposite.Centuries ago, most of the people in Europe were peasants and they had to work in the fields all day. Noblemen, on the other hand, did not have to work. They stayed indoors and remained pale. You could always tell a nobleman from a peasant because a peasant had a tan. As a result, a skin so pale that veins (血管) were showed was considered a mark of great beauty.During the Industrial Revolution things changed. Farmers left their fields and went to work in factories, minesand mills. Working for long hours in dimly-lit factories and mines made theirskins pale. (78) Wealthy people, however, could afford to travel to sunny countries. They had the leisure to lie around on the beaches and get tan. Having a tan became a sign of wealth.In Western Europe and North America pale skin is no longer desirable. Instead of bleaching themselves white with lemon juice, many women spend their time under a sun-lamp. The desire for a quick tan has led to the invention of pills and lotions (涂剂) that darken the skin artificially without exposure to sunlight. These pills and lotions can be bought by anyone at any drugstore. A rich man can spend hundreds of dollars on a vacation in the sunny West Indies and get his suntan there. But his lowest-paid clerk can have what looks like the same tan out of a bottle for a few cents.

单选题Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest to the antenna (天线). But whether that causes any harm is not clear, scientists at the National Institute of Health said at a conference last month, adding that the study will not likely settle concerns of a link between cell phones and brain cancer. "What we showed is glucose(葡萄糖) metabolism(代谢) (a sign of brain activity) increases in the brain in people who were exposed to a cell phone in the area closest to the antenna," said Dr. Nora Volkow of the NIH, whose study was published in the Journal of the American Medical Association. The study was meant to examine how the brain reacts to electromagnetic fields caused by wireless phone signals. Volkow said she was surprised that the weak electromagnetic radiation (电磁辐射) from cell phones could affect brain activity, but she said the findings do not shed any light on whether cell phones cause cancer. "This study does not in any way indicate that . What the study does is to show the human brain is sensitive to electromagnetic radiation from cell phone exposures." Use of the devices has increased dramatically since they were introduced in the early 1980s, with about 5 billion cell phones now in use worldwide. Some studies have linked cell phone exposure to an increased risk of brain cancers, but a large study by the World Health Organization did not offer a clear answer to this. Volkow"s team studied 47 people who had their brain examined while a cell phone was turned on for 50 minutes and another while the phone was turned off. While there was no complete change in brain metabolism, they found a 7 percent increase in brain metabolism in the region closest to the cell phone antenna when the phone was on. Experts said the results were interesting, but urged that they be understood with great care. "Although the biological significance, if any, of increased glucose metabolism from too much cell phone exposure is unknown, the results require further investigation," Henry Lai of the University of Washington in the U.S. and Dr. Lennart Hardell of University Hospital in Sweden, wrote in an article in JAMA. "Much has to be done to further investigate and understand these effects." They wrote.

单选题My parents will move back into town in a year or ______. A. later B. after C. so D. about

单选题I wish you ______ to me before you went and bought that car.

单选题______their service, many taxi drivers in Shanghai are going to learn everyday English.

单选题Kate can't drive yet, but she wants ______.

单选题______ yesterday, you would have met Professor Jones. But now he has left for London. A. Did you come B. Had you come C. Should you come D. Were you to come

单选题There is still a ______ possibility that their team may win in the last match.

单选题He asked for ______ classes at home because he thought he would learn French more quickly. A. private B. personal C. particular D. peculiar

单选题Tom said that he wouldn't mind ______ .

单选题There is only one boat ______ for hire. I'm afraid you have to wait for the next one. A. superior B. capable C. complicated D. available

单选题Your gestures need to accompany and ______ what you are saying.

单选题It"s hard to remember a name when one doesn"t have a face to go with ______.

单选题Customer: Excuse me, can I draw on my account for payment of things I buy in China? Clerk: ______How much do you draw?

单选题Interestingly enough, the two brothers have noting in ______.

单选题Every director needs an assistant that he can ______ to take care of problems that may occur in his absence.

单选题Speaker A: You'd better take the umbrella with you. It looks like it's going to rain. Speaker B: Thank you ______. A. for minding me B. for reminding me C. for remembering me D. for earing about me

单选题Michael: Hi, mom. I'd like you to meet my girlfriend, Susan Lee. Mother: How do you do, Susan. I'm glad you can join us. ______.