单选题{{U}}Enormous{{/U}} sums of money have been spent on space exploration. A. Much B. Large C. Small D. Fixed

单选题The rules are too rigid to allow for human error.

单选题The girl practiced Uceaselessly /Uto become a professional pianist.

单选题My mother has lived {{U}}separately{{/U}} since my father died 20 years ago.

单选题The Smog For over a month, Indonesia was in crisis. Forest fires raged out of control as the country suffered its worst drought for 50 years. Smoke from the fires mixed with sunlight and hot dry air to form a cloud of smog. This pollution quickly spread and within days it was hanging over neighboring countries including Malaysia, Singapore and Thailand. When the smoke combined with pollution from factories and cars, it soon became poisonous. Dangerous amounts of CO became trapped under the smog and pollution levels rose. People wheezed (喘息) and coughed as they left the house and their eyes watered immediately. The smog made it impossible to see across streets and whole cities disappeared as grey soot (烟灰) covered everything. In some areas, water was hosed (用胶管浇) from high-rise city buildings to try and break up the smog. Finally, heavy rains, which came in November. Put out the fires and clear the air. But the environmental costs and health problems will remain. Many people from South-Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes and factory pollution Breathing problems could well increase and many non-sufferers may have difficulties for the first time. Wildlife has suffered too. In lowland forests, elephants, deer, and tigers have been driven out of their homes by smog. But smog is not just an Asian problem. In fact .was world was first used in London in 1905 to describe the mixture of smoke and thick fog. Fog often hung over the capital. Sometimes the smog was so thick and poisonous that people were killed by breathing problems or in accidents. About 4,000 Londoners died within five days as a result of thick smog in 1952.

单选题It is no use debating the relative merits of this policy.

单选题The two banks have announced plans to merge next year.

单选题The scientists began to {{U}}accumulate{{/U}} a huge mass of data. A. amass B. put up C. make up D. clear up

单选题She was grateful to him for being so good to her.

单选题Their business was successful as they now had a Ucompatible/U board of directors.

单选题It"s prudent to start any exercise program gradually at first.

单选题The passage implies that the writer and her boyfriend live in

单选题Global warming would have a devastating impact on low, lying island.

单选题UPractically/U all species of animals communicate either through sounds or through a large repertory of soundless codes.

单选题{{B}}第二篇{{/B}} How to Stay Young If you want to stay young, sit down and have a good think. This is the research finding by a team of Japanese doctors, who say that most of our brains are not getting enough exercises, and as a result, we are ageing unnecessarily soon. Professor Taiju Matsuzawa wanted to find out why otherwise healthy farmers in northern Japan appeared to be losing their ability to think and reason at a relatively early age, and how the process of ageing could be slowed down. With a team of colleagues at Tokyo National University, he set about measuring brain volumes of a thousand people of different ages and varying occupations. Computer technology enabled the researchers to obtain precise measurement of the volumes of the front and side sections of the brain, which are related to intellect and emotion, and determine the human character. (The rear section of the brain, which controls functions like eating and breathing, does not contract with age, and one can continue living without intellectual or emotional faculties. ) Contraction of front and side part-as cells die off-was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds. Matsuzawa concluded from his tests that there is a simple remedy to the contraction normally associated with age: using the head. The findings show in general terms that contraction of the brain begins sooner in people in the country than in the towns. Those least at risk, says Matsuzawa, are lawyers, followed by university professors and doctors. White collar workers doing routine work in government offices are, however, as likely to have shrinking brains as the farm worker, bus driver and shop assistant. Matsuzawa's findings show that thinking can prevent the brain from shrinking. Blood must circulate properly in the head to supply the fresh oxygen the brain cells need. "The best way to maintain good blood circulation is using the brain," he says. "Think hard and engage in conversation. Don't rely on pocket calculators. "

单选题According to Einstein's theory, objects in the area of a black hole

单选题 What should be done if one wants to gain or lose weight? The process of gaining or losing weight can be explained by comparing your body to your car. Both run {{U}} {{U}} 1 {{/U}} {{/U}}fuel, food for your body and gasoline for your car. Both {{U}} {{U}} 2 {{/U}} {{/U}}that fuel, first into heat, then energy, some of {{U}} {{U}} 3 {{/U}} {{/U}}is used to do work, and some emitted as waste. And {{U}} {{U}} 4 {{/U}} {{/U}}your car uses more energy when the engine is racing than when it is idling, {{U}} {{U}} 5 {{/U}} {{/U}}does your body use more energy when you are working hard than {{U}} {{U}} 6 {{/U}} {{/U}}you are resting. For the purpose of this comparison, {{U}} {{U}} 7 {{/U}} {{/U}}, there is one significant difference between them. Your car cannot store fuel by turning it into {{U}} {{U}} 8 {{/U}} {{/U}}else; all gasoline not {{U}} {{U}} 9 {{/U}} {{/U}}remains as gasoline. But your body stores {{U}} {{U}} 10 {{/U}} {{/U}}energy as fat. When the gas tank is {{U}} {{U}} 11 {{/U}} {{/U}}empty, the car won't run; but your body can burn fat to provide more energy. Therefore, if you want to gain weight, you must do {{U}} {{U}} 12 {{/U}} {{/U}}of two things: eat more calories (units of heat, therefore energy), or use less through {{U}} {{U}} 13 {{/U}} {{/U}}. If you want to lose weight, you do the {{U}} {{U}} 14 {{/U}} {{/U}}, decrease your intake of calories or increase the amount of energy you spend. There is {{U}} {{U}} 15 {{/U}} {{/U}}way. Gaining or losing weight is always a relation between intake and output of potential energy.

单选题Thomas Fuller {{U}}was{{/U}} so {{U}}skilled at{{/U}} mathematics that he was known in the eighteenth century as the “Virginia Calculator.”

单选题Although costs are falling, wheel motors are generally more expensive than conventional drivetrains, and they don't handle as well as conventional cars. Wheel-motor vehicles may not catch on in a big way for a decade or so, but improvements in the technology and the push for efficiency could transform ring magnets into a new standard for powering cars. What is the reason that wheel motors will no| catch up with traditional cars soon?A. Wheel motors are more expensive and prices are still rising.B. Wheel motors are not as easy as traditional cars to use.C. The technology is not making improvement at present.D. The technology cannot save as much energy as expecte

单选题Apparently in interviews he refuses to talk about his private life.