单选题The tunnels should be strengthened because of their ______ to an attack that could result in mass casualties.

单选题He reminded me of what I should have forgotten. ______

单选题Go straight forward and you _____ the shop on your right．

单选题The early retirement of experienced workers is seriously harming the US economy, according to a new report from the Hudson Institute, a public policy research organization. Currently, many older experienced workers retire at an early age. According to the recently issued statistics, 79 percent of qualified workers begin collecting retirement benefits at age 62; if that trend continues, there will be a labor shortage that will hinder the economic growth in the twenty-first century. Older Americans constitute an increasing proportion of the population, according to the US Census Bureau, and the population of those over age 65 will grow by 60% between 2001 and 2020. During the same period, the group aged 18 to 44 will increase by only 4%. Keeping older skilled workers employed, even part time, would increase US economic output and strengthen the tax base; but without significant policy reforms, massive early retirement among baby boomers seems more likely. Retirement at age 62 is an economically rational decision today. Social Security and Medicaid earnings limits and tax penalties subject our most experienced workers to marginal tax rates as high as 67%. Social Security formulas encourage early retirement. Although incomes usually rise with additional years of work, any pay increases after the 35-year mark result in higher social Security taxes but only small increases in benefits. Hudson Institute researchers believe that federal tax and benefit policies are at fault and reforms are urgently needed, but they disagree with the popular proposal that much older Americans will have to work because Social Security will not support them and that baby boomers are not saving enough for retirement. According to the increase in 401 (k) and Keogh retirement plans, the ongoing stock market on Wall Street, and the likelihood of large inheritances, there is evidence that baby boomers will reach age 65 with greater financial assets than previous generations. The Hudson institute advocates reforming government policies that now discourage work and savings, especially for older worker. Among the report"s recommendations: Tax half of all Social Security benefits. regardless of other income; provide 8% larger benefits for each year beyond 65; and permit workers nearing retirement to negotiate compensation packages that may include a lower salary but with greater healthcare benefits. However, it may take real and fruitful planning to find the right solution to the early retirement of older experienced workers; any measures taken must be allowed to prolong the serviceability of older experienced workers.

单选题______ nuclear weapons can be used on the battlefield, infantry soldiers (步兵) are permitted to spread out for even more protection.

单选题 If you lose your job I'll lose mine, so we're in the same ______.

单选题Nobody knew how he came up with this ______ idea about the trip.

单选题Most of them had visited the invalid often during the past few months, marveling at his ______ spirit and his unfailing good temper.

单选题Countries that traditionally never allowed foreign students to stay and work—like Germany or the United Kingdom—are facing their own labor ______ in information technology and relaxing their immigration laws.

单选题On the day of the accident, part of the old road ______.

单选题Should you not be able to accept to be our agency in your area, perhaps you could ______ some other reliable and well-established firms whom we might approach. A．demand B．commend C．recommendation D．recommend

单选题 Questions2-5 are based on the conversation you have just heard.

单选题Alexander Graham Bell invented______telephone in 1876.

单选题Many farms in the southern United States yield hay and tobacco.

单选题He was regarded as a great ______ to the committee. A. asset B. profit C. prosperity D. interest

单选题My attention was engaged by the article's Ucaption/U.

单选题Peter has planned to ______ some money every month so that he can buy a used car next year.