单选题I have no alternative but to report him to the local police.

单选题Even with detailed knowledge about an area, geologists cannot easily locate stores of underground natural gas.

单选题Hundreds of years ago cloves were used to remedy headaches.

单选题We consume a lot more than we are able to produce.

单选题It seems incredible that he had been there a week already.

单选题The accommodation was cheap, but the food was very {{U}}expensive{{/U}}. A. high B. costly C. dear D. overpaid

单选题There is a growing gap between the rich and the poor. ______

单选题He wore a shabby thin overcoat in the cold winter so that he fell ill.

单选题Migrant (移民的) Workers In the past twenty years, there has been an increasing tendency for workers to move from one country to another. While some countries have restricted most 16 to local people, others have attracted and welcomed migrant workers. This is particularly the case in the Middle East, 17 increased oil incomes have enabled many countries to call in outsiders to improve local facilities. Thus the Middle East has attracted oil-workers 18 the U.S. A. and Europe. It has brought in workers from many countries, 19 South Korea and Japan. In view of the difficult living and working 20 in the Middle East, it is not surprising that the pay is high to attract suitable workers. Many engineers and technicians can 21 at least twice as much money in the Middle East as they can in their own country, and this is a major 22 . Sometimes a disadvantage has a compensating (补偿的) advantage. For example, the 23 living conditions often lead to increased friendship when workers have to 24 on each other for safety and comfort. In a similar way, many migrant workers can save large sums of money partly because of the 25 of entertainment facilities. The work is often complex and full of problems but this merely 26 greater challenge to engineers who prefer to find solutions to problems rather than do routine work in their home country. One major problem which 27 migrant workers in the Middle East is that their jobs are temporary ones. They are nearly always on 28 , so it is not easy for them to plan ahead with great confidence. This is to be 29 since no country welcomes a large number of foreign workers as permanent residents. In any 30 , migrant workers accept this disadvantage, along with others, because of the considerable financial benefits which they receive.

单选题He noticed that Joan was studying him closely, but her expression gave away nothing of what she was thinking.

单选题Her sister {{U}}urged{{/U}} her to apply for the job.

单选题I had some difficulty in {{U}}carrying out{{/U}} the plan.

单选题Dancing in the Streets If there is one thing certain to get Brazilians on their feet, it is the Rio Carnival (狂欢节). Held in Rio de Janeiro, the country's biggest city, the carnival began on February 20 when the mayor gave key of the city to Rei Momo-the Lord of Misrule (无序之皇) On his orders, each year people turn the city into a paradise of dance and music. The following six days are so fun of parades, street dancing, fantastic clothes and partying (聚会) that many people forget about eating and sleeping. "It was the passion of the carnival that attracted me to Brazil and made me settle down in Rio. " said Bob Nadkarni, a British man who has lived in the city for several years. For many Brazilians, the centerpiece of the carnival is samba (桑巴舞) , a typical Brazilian dance. Every year, tens of thousands of visitors and locals show off their passion and energy in the streets, following the beat (节拍) of the Latin music. The climax to this street party is the float(彩车) parade, in which floats decorated with tons of fresh flowers by various samba schools and local communities move through the city. On the top of each float stands the candidate for the Drum Queen, who is chosen at the end of the party. While most people are free to enjoy the celebrations. Rio's police officers have to keep a clear head. Following the murder of three officers in a gunfight early last week, the Brazilian Government has tightened security in Rio. The street fighting, robbery and sex crimes that accompany the carnival are very difficult to police. Carnivals began in ancient Rome as a celebration at which people fed wild wolves, in honor of the city's founder who was said to have been raised by a she-wolf. Brazil gave new life to this tradition and so despite the troubles, the carnival will remain a symbol of the country's culture.

单选题"Ice Explorer" Ready For Launch The European space agency's mission to assess the state of the world's ice cover is likely to launch in February. The Cryosat -2 spacecraft will go into orbit on a Dnepr rocket from Baikonur, Kazakhstan, the agency has announced. The satellite is a rebuild of the mission that was destroyed in 2005 when its launcher failed just minutes into its flight. Cryosat - 2's radar instrument will make detailed maps of the ice that covers both sea and land at the poles. Data from other satellites has already indicated that some of this cover is diminishing at a rapid rate in response to climate change, with the biggest melting occurring in the Arctic. The completed Cryosat -2 is undergoing final checks here at the IABG technical centre in Ottobrunn near Munich, Germany, a test facility used by satellite manafacturers. It was hoped Cryosat -2 could launch in December, but the flight has been delayed now until next year. Esa said there was a queue of missions waiting for a ride on the Russian - Ukrainian Dnepr rocket. "Yes, it's frustrating, hut that's bow it is," conceded Volker Liebig, Esa's director of Earth observation pragrammes. "On the other hand it gives us a little bit more time to [ train and prepare the ground team ], which means when we do get into orbit we'll be ready to start operations rapidly because of all the work we've dobe in advance. " Mission managers are targeting 28 February for a launch. The inability of the agency to loft its satellites at a time of its choosing should become less of a problem when it has access to its new Vega rocket. Vega, which will operate out of Europe's Kourou spaceport in French Guiana, has been designed specifically to carry small institutional payloads such as Cryosat to odfit. However, the rocket is not expected to enter into service until the middle of next year. Cryosat - 2 is part of Esa's Earth Explorer programme - seven spacecraft that will do innovative science in obtaining data on issues of pressing environmental concern. The first in the series, Goce ( Gravity Field and Steadyr - State Ocean Circulation ), was launched in March.

单选题When lava cools, it becomes

单选题John doesn’t believe in traditional medicine ; he has some remedies of his own.A. standardB. regularC. routineD. conventional

单选题Winston Churchill gave a {{U}}moving{{/U}} speech.

单选题It's {{U}}prudent{{/U}} to start any exercise program gradually at first.

单选题The psychiatrists declared the killer insane.A. violentB. crazyC. uneducatedD. innocent

单选题Screen Test Every year millions of women are screened with X-rays to pick up signs of breast cancer. If this happens early enough, the disease can often be treated 1 . According to a survey published last year, 21 countries have screening programmes. Nine of them, including Australia, Canada, the U.S. and Spain, 2 women under 50. But the medical benefits of screening these younger 3 are controversial, partly because the radiation brings a small risk of inducing cancer. 4 , younger women must be given higher doses of X-rays because their breast tissue is denser. Researchers at the Polytechnic University of Valencia analyzed the effect 5 screening more than 160,000 women at 11 local clinics. After estimating the women"s cumulative dose of radiation, they used two models to calculate the number of extra cancers this 6 cause. The mathematical model recommended by Britain"s National Radiological Protection Board (NRPB) predicted that the screening programme would 7 36 cancers per 100,000 women, 18 of them fatal. The model preferred by the UN Scientific Committee on the Effects of Atomic Radiation 8 a lower figure of 20 cancers. The researchers argue that the level of radiation-induced cancers is "not very significant" 9 to the far larger number of cancers that are discovered and treated. The Valencia programme, they say, detects between 300 and 450 10 of breast cancer in every 100,000 women screened. But they 11 that the risk of women contracting cancer from radiation could be reduced by between 40 and 80 percent if screening began at 50 instead of 45, because they would be exposed to 12 radiation. The results of their study, they suggest, could help "optimise the technique" for breast cancer screening. " 13 is a trade-off between the diagnostic benefits of breast screening and its risks," admits Michael Clark of the NRPB. But he warns that the study should be interpreted with caution. "On the 14 of the current data, for every 10 cancers successfully detected and prevented there is a risk of 15 one later in life. That"s why radiation exposure should be minimised in any screening programme."