单选题A Food and Drug Administration (FDA) advisory committee has concluded that a novel new treatment can greatly help rheumatoid arthritis patients. The panel recommended approving Enbrel for use alone in patients who haven"t responded to other drugs or in combination with methotrexate, a cancer drug that has been the main treatment for rheumatoid arthritis. The FDA must make a final decision by early November, and the drug"s maker says it could be on the market by year"s end. In rheumatoid arthritis, which affects 2.1 million Americans, the immune system attacks healthy joints. A major wrongdoer in this process is a protein called "tumor killing factor", or TNF, which interacts with a special molecule, or TNF receptor, on cells" surfaces. To keep inflammation in check, cells normally release some receptors to mop up excess TNF, rendering it inactive. Apparently, rheumatoid arthritis patients don"t have enough free-floating TNF receptors. Enbrel consists of genetically engineered TNF receptors. In a six-month study, 234 patients with advanced rheumatoid arthritis received one of two doses of Enbrel or a placebo ( harmless substance given as if it were medicine ) in twice-a-week injections. They took injections for six months. By the end, 40% of patients on the larger Enbrel dose saw symptoms, such as swelling and joint pain, cut in half. Only 5% on the placebo did that well. The main side effect was minor irritation at the injection site. Because some TNF is needed for a normal immune response, there is at least a theoretical risk of infections or even cancer in patients who take Enbrel, so the FDA panel urged long-term safety studies. Last week, the FDA approved Arava, an oral treatment for rheumatoid arthritis that is similar to methotrexate. While calling both Enbrel and Arava "potentially very important", Brian Butcher, vice president for research at the Arthritis Foundation, notes they have been tested in relatively few patients. Butcher says their safety should be closely monitored once they"re widely available.

单选题The 4th paragraph suggests that______.

单选题The United States economy made progress in reducing unemployment and moderating inflation. On the international side, this year was much calmer than last. Nevertheless, continuing imbalances in the pattern of world trade contributed to intermittent strains in the foreign exchange markets. These strains intensified to crisis proportions, precipitating a further devaluation of the dollar. The domestic economy expanded in a remarkably vigorous and steady fashion. The resurgence in consumer confidence was reflected in the higher proportion of incomes spent for goods and services and the marked increase in consumer willingness to take on installment debt. A parallel strengthening in business psychology was manifested in stepped-up rate of plant and equipment spending and a gradual pickup in outlays for inventory. Confidence in the economy was also reflected in the strength of the stock market and in the stability of the bond market. For the year as a whole, consumer and business sentiment benefited from rising public expectations that a resolution of the conflict in Vietnam was in prospect and that East-West tensions were easing. The underpinnings of the business expansion were to be found in part in the stimulative monetary and fiscal policies that had been pursued. Moreover, the restoration of sounder liquidity positions and tighter management control of production efficiency had also helped lay the groundwork for a strong expansion. In addition, the economic policy moves made by the President had served to renew optimism on the business outlook while boosting hopes that inflation would be brought under more effective control. Finally, of course, the economy was able to grow as vigorously as it did because sufficient flexibility existed in terms of idle men and machines. The United States balance of payments deficit declined sharply. Nevertheless, by any other test, the deficit remained very large, and there was actually a substantial deterioration in our trade account to a sizable deficit, almost two thirds of which was with Japan. While the overall trade performance proved disappointing, there are still good reasons for expecting the delayed impact of devaluation to produce in time a significant strengthening in our trade picture. Given the size of the Japanese component of our trade measures undertaken by Japan. Also important will be our own efforts in the United States to fashion internal policies consistent with an improvement in our external balance.

单选题{{I}} Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.{{/I}}

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单选题In the author's opinion, looking up all the words you don't know when you are reading in English is______.

单选题The outer of athletic events at the ancient Olympics ______.

单选题Which of the following region is the second hardest hit region by AIDS in the world?

单选题Everyone in China ______ Mid-Autumn Day. A. likes B. like C. to like

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单选题Tish Sommers argues that ______.

单选题Question 14—16 are based on the following talking about examination. You now have 15 seconds to read Questions 14—16.

单选题 Questions 18-21 are based on the following conversation.

单选题All the following statements are true except that

单选题Which kind of food is recommended to prevent heart disease, cancer, diabetes, high blood pressure, stroke, and weak bones?