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The night is not what it was. Once, the Earth was cast half in shadow. Then came fire, candle, and light bulb, gradually drawing back the curtain of darkness. But a brighter world has its drawbacks.An estimated 30 percent of outdoor lighting--plus even some indoor lighting--is wasted. Inefficient lighting costs U. S. about ＄10.4 billion a year, according to Bob Gent of the International Dark-Sky Association, a nonprofit that aims to control light pollution.Last year in Sydney, an estimated 2.2 million Australians switched off their lights during "Earth Hour", briefly reducing that city’s energy use by more than 10 percent. Motivated by such trends, more than two dozen cities worldwide went dim on March 29 this year in an hour-long demonstration.A number of groups are trying to measure light pollution and assess its effects on the environment in the hope that people will reduce their own contribution to the problem. Scientists aye trying to report how many stars we can see. In dark rural areas, about 2,000 stars are typically visible at night, compared with "maybe five" in a bright city square--and about 5,000 in centuries past.People who are working while others are star-gazing may face the greatest risks. Nighttime exposure to white light can cause the growth of tumors (肿瘤), experiments show. Two decades of research indicate that women who work night shifts have unusually high rates of breast cancer. On March 29 this year, people in many cities around the world （）
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It is wise to remember that you do not have to buy anything from any salesperson. You ought to buy only those things you really need or want and can（1）. Try not to let your personal feelings about the salesperson（2） you to make a purchase. Remember that you are entitled to ask a salesperson any question you wish （3） the product or service, and you are entitled to get a clear, complete（4）. You call tell the salesperson you want to think about the matter, for a few days, （5） that you want to talk to other people who have purchased the product or service. You can walk（6） from a salesperson without a polite end to the conversation. If a salesperson telephones you, you do not have to listen to the person’s entire "lecture" or respond to it in a friendly way. You can simply interrupt the person and state that you are not interested in the product or service. You can simply（7） the telephone without saying anything.There are, of course, many salespeople who are genuinely interested in assisting you and in （8） you reasonable products and prices. If you are in （9） about the wisdom of a particular purchase, you might want to（10）another person who has had experience with the product or the service that interests you. If you receive unwanted goods in the mail, you are not obligated to pay for it. and you are entitled to get a clear, complete（）.
有关数据显示，从2005年以来，广东高校毕业生自主创业的数量约占当年高校毕业生的1%—2%。以2008年为例，应届高校毕业生中选择自主创业的仅占1.2%。而在西方发达国家，这个数字为20%—30%。由此看来，西方发达国家的大学生更具有创业才能。以下选项中，最能对上述结论构成质疑的是( )。
Male advertisersFemale advertisers1MALE, aged 25, WLTM female, n/s, 20-30 for friendship, possible romance.I like pubs, clubs, staying in, aswell as going out. I live in theWindsor area and t get on well withkids.AFEMALE, 26, prof, fairlyslim, WLTM a slim male, 26-33, for friendship andpossible romance.2IF you are not separated oremotionally unstable but are a widowover 55 & looking for partner withview to long-term & meaningfulrelationship, then this 67 year oldwidower could be the one for you.BACTIVE lady, living inMaidstone area, early 60sWLTM females or males forfriendship and to shareinterests, mostly travel.3HL, I’m Andy, 32yo and divorced. Ahappy-go-lucky person looking for alady between 25 and 40. Single parentswelcome as I love children and a homelife.CARE you the romantic,friendly, articulate malewith varied interests and aGSOH that this woman islooking for If so and you’re40ish-50ish but feeling 30ishthen we will have a lot incommon.4MALE, 50s, caring, & sincere, with aGSOH, seeks an affectionate lady forfriendship, possible romance.DLADY, 40s, fairly slim, seeksa kind, generous, warm-hearted man, about same age,for friendship and outings.5I am an energetic man of 63, butdon’t look it. I have a good head ofhair. I like country find westernmusic and historical places, walking,a pint now and again. I’m stillworking part-time, but I don’t drive.I have a GSOH.EHELLO. my name is Liz. I am19 yrs old and live in theCambridge area. I am seekinga male 20-25. enjoy pubs andclubs and I like nights in orout and I like children. I AM5’5″ with red hair. A possible match for Female D is （）
As our van pulled up to the ranch (牧场) to start a three-month program for troubled boys, we passed a cowboy on his horse. Bill was the owner of the ranch. We made eye contact through the dusty window and he winked (挤眼睛) at me and touched the brim of his cowboy hat in welcome.All summer long Bill and his ranch-hands taught us to ride horses, chop wood, and round up cattle. We started to understand the value of working with our hands. Knowing how important it was for boys like me to know that someone believed in them, he trusted us to do the job and do it right. We never let him down.The last day at the ranch, Bill pulled me aside and praised me for the work I had done-- not only on the ranch, but also on myself. He told me if I ever needed anything I could count on him.Four years later, I took him up on that offer. I called him up and asked for a job. I told him how his confidence in me had given me the’ courage to change my life. He offered me a job on the spot. I’m proud to say that each summer I’m the one in the ranch to open the gate for a van full of young men who need someone to believe in them, so they can learn to believe in themselves. The author implies what the troubled boys needed most was （）
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