题目内容
----The 2011 College Entrance Examination has just been over!
----Yes, it will be about two years _____we attend it.
| A．until | B．before | C．after | D．since |
B
解析
优百分课时互动系列答案
开心蛙状元作业系列答案D
Holding a cell phone against your ear or storing it in your pocket may be dangerous to your health. This explains a warning that cell phone manufacturers include in the small print that is often ignored when a new phone is purchased. Apple, for example, doesn’t want iPhones to come closer to you than 1.5 centimeters; Research In Motion, BlackBerry’s manufacturer, recommends 2.5 centimeters.
If health issues arise from cell phone use, the possible effects are huge. Voice calls - Americans chat on cell phones 2.26 trillion(万亿)minutes annually - earn $109 billion for the wireless carriers.
Devra Davis, an expert who has worked for the University of Pittsburgh, has published a book about cell phone radiation, “Disconnect.” The book surveys scientific research and concludes the question is not settled.
Brain cancer is a concern that Ms. Davis examines. Over all, there has not been an increase in its incidence since cell phones arrived. But the average masks an increase in brain cancer in the 20-to-29 age group and a drop for the older population.
“Most cancers have multiple causes,” she says, but she points to laboratory research that suggests low-energy radiation could damage cells that could possibly lead to cancer.
Children are more vulnerable to radiation than adults, Ms. Davis and other scientists point out. Radiation that penetrates only five centimeters into the brain of an adult will reach much deeper into the brains of children because their skulls are thinner and their brains contain more absorptive fluid（易吸收的液体）. No studies have yet been completed on cell phone radiation and children, she says.
Henry Lai, a research professor in the bioengineering department at the University of Washington, began laboratory radiation studies in 1980 and found that rats exposed to radiation had damaged DNA in their brains.
Ms. Davis recommends using wired headsets or the phone’s speaker. Children should text rather than call, she said, and pregnant women should keep phones away from the abdomen（腹部）.
【小题1】Why is the warning in the small print?
| A．They think people will not care about it. |
| B．There is not enough space for the warning. |
| C．They don’t want the users to pay attention to it. |
| D．The warning is not important at all. |
| A．acceptable | B．valuable | C．accessible | D．easily affected |
| A．Pregnant women should keep cell phones away. |
| B．People should use cell phones in the correct way. |
| C．If you are a child, you’d better text than make phone calls. |
| D．When you use a cell phone, use a wired headset or the phone’s speaker. |
| A．Be careful when using cell phones. |
| B．Don’t hold your cell phone against your ear. |
| C．Rats exposed to radiation have damaged DNA in their brains. |
| D．Low-energy radiation could damage cells that could lead to cancer. |
根据短文内容，从下框的A----E选项中选出能概括每一段主题的最佳选项。选项中有一项为多余选项。
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May 19,1991 was a red letter day for the people of Nanxi Town,Jinzhai County,in the Dabie
Mountain area of Anhui Province．On that day the townpeople cut the ribbon at the inauguration（落成典礼）of a primary school,the first in China set up with money raised in a national campaign for educational development．They were happy to see their children,who had been deprived（剥夺）of an education because of poverty,entering school．
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The Dabie Mountain range lies at the juncture of Hubei,Henan and Anhui provinces．Jinzhai
County,located in the highest section of the mountain range,has within its boundaries more than 100 peaks each exceeding1,000 meters in height．Due to the unfavorable natural conditions,some people in the county are unable to feed and clothe themselves adequately no matter how hard they work throughout the year．About 1,500 children have dropped out of school because their parents are unable to pay the fees for them．
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Huangpin,a povert-stricken village situated in the a cold area 750 metres above sea level,is
tipical of the county．Among the village’s 224 children between the ages of 7 and 15,there are 80 who are unable to go to school because of economic problems．Some pupils have to cut firewood after school to support themselves．Some leave school to look after cattle and pigs because they cannot afford the 20 yuan necessary for buying books．
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The county’s leaders have long realized that it is very difficult for county in which 36%of the
people are illiterate（文盲）to free itself of poverty．In order to change this situation,they have spent 1/3 of the county’s tax income on education for several years’ running．In order to enrol（招收）more children,teachers from some schools have climbed hills to encourage people to send their children to school．Some teachers have even paid their students’ fees from their own pockets,although their salaries are very low．
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According to statistics（统计数据）in China,more than one million school-age children are
unable to go to school because of economic problems．In October 1989,the China Foundation for the Development of Children and Youth appealed to the country and the world to raise money for the education of children in poverty-stricken areas．Since children are the future of the country,this project is called “The Hope Project”．