单选题The cause fro the heat in the interior of the earth is _______.

单选题Their style of playing football is {{U}}utterly{{/U}} different, A.barely B.scarcely C.hardly D.totally

单选题Steve is deliberately staying away from the meeting to show his disapproval of the proposal.

单选题Gambling is lawful in Nevada. A. popular B. booming C. legal D. profitable

单选题The economy continued to exhibit signs of decline in September. A. play B. show C. send D. tell

单选题The title"Light Night,Dark Stars"means

单选题It"s impolite to cut in when two persons are holding a conversation.

单选题{{B}}第二篇{{/B}} After the violent earthquake that shook Los Angeles in 1994, earthquake scientists had good news to report: The damage and death toll could have been much worse. More than 60 people died in this earthquake. By comparison, an earthquake of similar intensity that shook America in 1988 claimed 25,000 victims. Injuries and deaths were relatively less in Los Angeles because the quake occurred at 4:31 a. m. On a holiday, when traffic was light on the city's highways. In addition, changes made to the construction codes in Los Angeles during the last 20 years have strengthened the city's buildings and highways, making them more resistant to quakes. Despite the good news, civil engineers aren't resting on their successes. Pinned to their drawing boards are blueprints for improved quake - re - sistant buildings. The new designs should offer even greater security to cities where earthquakes often take place. In the past, making structures quake-resistant meant firm yet flexible materials, such as steel and wood, that bend without breaking. Later, people tried to lift a building off its foundation, and insert rubber and steel between the building and its foundation to reduce the impact of ground vibrations. The most recent designs give buildings brains as well as concrete and steel supports. Called smart buildings, the structures respond like living organisms to an' earthquake's vibrations. When the ground shakes and the building tips forward, the computer would force the building to shift in the opposite direction. The new smart structures could be very expensive to build. However, they would save many lives and would be less likely to be damaged during earthquakes.

单选题The Greatest Mystery Of Whales The whale is a warm-blooded, air-breathing animal, giving birth to its young alive, sucking them-and, like all mammals, originated on land. There are many (51) of this. Its front flippers (鳍状肢), used for steering and stability, are traces of feet. Immense strength is (52) into the great body of the big whales, and in fact most of a whale's body is one gigantic muscle. The blue whale's pulling strength has been estimated (53) 400 horsepower. One specimen was reported to have towed (拖) a whaling vessel for seven hours at the (54) of eight knots (节). An angry whale will (55) a ship. A famous example of this was the fate of whaler Essex, (56) was sunk off the coast of South America early in the last century. More recently, steel ships have (57) their plates buckled (使弯曲) in the same way. Sperm whales (抹香鲸) were known to seize the old-time whaleboats in their jaws and crush them. The greatest (58) of whales is their diving ability. The sperm whale dives to the bottom for his (59) food, the octopus (章鱼). In that search he is known to go as far down as 3,200 feet, where the (60) is 1,400 pounds, to a square inch. Doing so he will (61) underwater long as one hour. Two special skills are involved in this: storing up enough (62) (all whales are air-breathed) and tolerating the great change in pressure. Just how he does it scientists have not (63) . It is believed that some of the oxygen is stored in a special (64) of blood vessels, rather than just held in the lungs. And it is believed that a special kind of oil in his head is some sort of compensating mechanism that (65) adjusts the internal pressure of his body. But since you can't bring a live whale into the laboratory, for study, no one knows just how these things work.

单选题Never speak out the secret ______.A. secretlyB. cleverlyC. foolishlyD. publicly

单选题Climate Change Poses Major Risks for Unprepared Cities A new examination of urban policies has been (51) recently by Patricia Romero Lankao. She is a sociologist specializing in climate change and urban development. She warns that many of the world's fast-growing urban areas, especially in developing countries, will likely (52) the impacts of changing climate. Her work also concludes (53) most cities are failing to reduce emissions of carbon dioxide and other greenhouse gases. These gases are known (54) affect atmosphere. "Climate changes a deeply local issue and poses profound threats to the growing cities of the world," says Romero Lankao. "But (55) cities are developing effective strategies to protect their residents. " Cities are (56) sources of greenhouse gases. And urban populations are likely to be among those most severely affected by future climate change. Lankao's findings (57) ways in which city-residents are particularly vulnerable, and suggest policy interventions that could offer immediate and longer-term benefits. The locations and dense construction patterns of cities often place their populations at greater. (58) for natural disasters. Potential threats associated with climate include storm surges and prolonged hot weather. Storm surges can flood coastal areas and prolonged hot weather can heat (59) paved cities more than surrounding areas. The impacts of such natural events can be more serious in an urban environment. (60) , a prolonged heat wave can increase existing levels of air pollution, causing widespread health problems. Poorer neighborhoods that may lack basic facilities such as drinking water or a dependable network of roads, are especially vulnerable to natural disasters. Many residents in poorer countries live in substandard housing without (61) reliable drinking water, roads and basic services. Local governments, (62) , should take measures to protect their residents. "Unfortunately, they tend to move towards rhetoric rather than meaningful responses," Romero Lankao writes. "They don't impose construction standards that could reduce heating and air conditioning needs. They don't emphasize mass transit and (63) automobile use. In fact, many local governments are taking a (64) approach. " Thus, she urges them to change their idle policies and to take strong (65) to prevent the harmful effects of climate change on cities.

单选题Groundwater, a resource that exists everywhere beneath the Earth's surface, is under increasing risk from contamination and overuse.

单选题A failure to consolidate their cooperation would damage both nations.

单选题It is convenient to purchase on line.

单选题The Smog (烟雾) 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 neighbouring countries including Malaysia, Singapore and Thailand. When the smoke combined with pollution from factories and cars, it soon became poisonous (有毒的). 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 cleared 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 (汽车排放的废气) 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, the word 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She read a poem which depicts the splendor of the sunset.

单选题Don't be {{U}}afraid{{/U}}. I am not going to hurt you.

单选题The sea turtle"s natural habitat has been considerably reduced.

单选题That fence over there forms the Uboundary/U between our garden and our neighbours

单选题There is an abundant supply of cheap labor in this country. A. a steady B. a plentiful C. an extra D. a meager