单选题The index is the government"s chief gauge of future economic activity.

单选题Many people leave their hearing problem untreated because

单选题Diabetes (糖尿病) and Eye Damage Over 2 million Canadians have diabetes. It is the leading cause of blindness in North Americans under 65 years of age. Diabetes is a condition where the body either cannot produce enough insulin (胰岛素) or cannot respond properly to insulin. Insulin is important because it moves glucose (葡萄糖), a simple sugar, to the body"s cells from the blood. The food people eat provides the body with glucose, which is used by the cells as a source of energy. If insulin isn"t available or doesn"t work correctly to move glucose from the blood into the cells, glucose will stay in the blood, leading to high blood sugar levels. High blood sugar levels damage the blood vessels, including the tiny blood vessels in the eye. This leads to an eye disease known as diabetic retinopathy (糖尿病型视网膜病). The retina (视网膜) is an area at the back of the eye that changes light into nerve signals. With diabetic retinopathy, some blood vessels in the retina are lost, and some of the other blood vessels begin to "leak" blood. This causes the retina to swell, and gradually cuts off its supply of oxygen and nutrients (滋养物). Eventually, the retina starts to grow new blood vessels to replace the damaged ones. Unfortunately, these new vessels are not as strong as the old ones. They are more likely to break, causing bleeding in the eye. At first, people with diabetic retinopathy will not notice any symptoms. As the disease gets worse, they may notice blurred (模糊的) vision, black spots or flashing lights. As time goes on, it can progress to blindness. Everyone with diabetes is at risk for diabetic retinopathy, and the risk increases the longer you"ve had diabetes. Fortunately, you can reduce your risk. If you do not have diabetes, but think you may be at risk for this condition, visit your doctor to be screened for diabetes. If you do have diabetes: ●Have frequent eye check-ups. ●Make sure that you monitor your blood sugar frequently and use your medications as recommended by your doctor. There is evidence to show that keeping your blood sugar under tight control can slow down eye damage. ●If you have high blood pressure, follow your recommended diet and medications to keep it under control. If you are not sure whether you have high blood pressure, or whether your blood pressure is under control, discuss this with your doctor.

单选题The main purpose of this meeting is to elect a new chairman.A. dominantB. minorC. keyD. major

单选题I realized to my {{U}}horror{{/U}} that I had forgotten the present. A. fear B. limit C. power D. fool

单选题But in the end he approved of our proposal.

单选题The police managed to track down the man in New York.A. searchB. catchC. pursueD. survey

单选题It is postulated that a cure for the disease will have been found by the year 2000.

单选题It was no surprise when we were told that our grandfather had {{U}}passed away{{/U}}.

单选题Messages can easily be sent from one operator to another as long as they share the same data store,A. haveB. typeC. emailD. store

单选题The children trembled with fear when they saw the policeman. A. wept B. cried C. ran D. shook

单选题During his whole life, even if he became a famous man, Nobel tried to avoid ______.A. publicB. probabilityC. publicityD. quarrel

单选题She has proved that she can be Urelied/U on in a crisis.

单选题He was one of the principal organizers of the association. A. planners B. employees C. actors D. recipients

单选题During the past ten years there have been dramatic changes in the international situation.

单选题She will be very pleased to meet you.

单选题Water Resource More than half of the water used for drinking, washing and irrigating comes from under the ground. This subterranean (地下的)water is known as groundwater. It is generally taken for granted that the groundwater drawn from wells is present every where and will always be available and clean and safe to drink. But experts are reporting that groundwater sources can dry up through overuse, or become contaminated as a result of pollution, poor sanitation (卫生)or salt water intrusion. This "invisible resource"—as groundwater was described by the United Nations for its 1998 observance (纪念)of World Day for Water—is slowly emerging in political, economic and personal affairs. With demand growing and supply presenting greater difficulties, groundwater is on the way to becoming a boom business. The World Bank estimates that the developing countries will require investments totaling $600 billion to repair and improve water systems. Of the investments that are actually made, a substantial amount will be devoted to extracting and piping groundwater, primarily for agricultural use and secondarily for industry and household consumption. With a trend towards privatization of public services, it can be expected that a growing portion of investments in water will come from the private sector; requirements that governments privatize water utilities are already being written into the terms of multilateral loans. One consequence of growing privatization may be that access to water will not be regraded as a right, but as a function of economic markets. Groundwater, which in its natural state is more protected than surface water, is the preferred source of drinking water for cities. But pressure is being placed on groundwater resources lying close to urban areas by exploding populations, as the portion of the world"s people residing in citied balloons from 31 percent in 1995 to a projected 50 percent in 2005. And there is also the pressure of dollars to purchase land lying above groundwater sources and to keep it in a natural state, in order to protect aquifers(蓄水层)from contamination. In the developing countries, where urban population growth is surpassing sewage systems, the problem of untreated human waste is extremely serious. Alongside the problems of public groundwater sources is the increased consumption of privately bottled water, most of which is named spring water, i.e. groundwater. Consumption of bottled water in the United States, for instance, has risen from virtually nil(零)in the 1950s to 843 million gallons in 1984 and 2.95 billion gallons in 1997. But drinking bottled water is not just a trend for the middle classes. In developing countries, water pipes rarely extend to the poorer neighbourhoods, and residents have no choice but to pay high prices for bottled water. Political leaders and analysts are talking more frequently about the possibility that increasing demand for precious groundwater will lead to cross—border conflicts, even wars. It is not easy to resolve disputes over the highest groundwater rights, since many aquifers and underground streams cross national borders; and a well drilled vertically within the boundaries of one country may very well be drawing water from the same aquifer, also chosen by a neighbouring nation. Inclined and even horizontal drilling further complicates this issue.

单选题The Badlands National Park was established in South Dakota to preserve this weirdly beautiful region.A. trulyB. strangelyC. exceedinglyD. impressively

单选题It needs hardly be said that a man who could ______ such treatment was a man of remarkable physical courage and moral strength.A. make the best ofB. catch up withC. get rid ofD. put up with

单选题Better Control of TB Seen If a Faster Cure Is Found The World Health Organization estimates that about one-third of all people are infected with bacteria that cause tuberculosis . Most times, the infection remains inactive. But each year about eight million people develop active cases of TB, usually in their (51) . Two million people die (52) it. The disease has (53) with the spread of AIDS and drug-resistant forms of tuberculosis. Current treatments take at least six months. People have to (54) a combination of several antibiotic drugs daily. But many people stop (55) they feel better. Doing that can (56) to an infection that resists treatment. Public health experts agree that a faster-acting cure for tuberculosis would be more effective. Now a study estimates just how (57) it might be. A professor of international health at Harvard University led the study. Joshua Salomon says a shorter treatment program would likely mean not just more patients (58) It would also mean (59) infectious patients who can pass on their infection to others. The researchers developed a mathematical model to examine the effects of a two-month treatment plan. They (60) the model with current TB conditions in Southeast Asia. The scientists found that a two-month treatment could prevent about twenty percent of new cases. And it might (61) about twenty-five percent of TB deaths. The model shows that these (62) would take place between two thousand twelve and two thousand thirty. That is, if a faster cure is developed and in wide use by two thousand twelve. The World Health Organization (63) the DOTS program in nineteen ninety. DOTS is Directly Observed Treatment, Short-course. Health workers watch tuberculosis patients take their daily pills to make (64) they continue treatment. Earlier this year, an international partnership of organizations announced a plan to expand the DOTS program. The ten-year plan also aims to finance research (65) new TB drugs. The four most common drugs used now are more than forty years old. The Global Alliance for TB Drug Development says its long-term goal is a treatment that could work in as few as ten doses.