单选题The three astronauts have splashed down in the Pacific Ocean, only six miles from the aircraft carrier that was _________ for the recovery mission.

单选题The spokesman made a critical ___________ of the company's economic strategy in the next Five-year Plan.

单选题______ is well-known to all, too much stress can cause disease.

单选题In this passage the author mainly argues that housing _____.

单选题Passage Three Questions 32 to 35 are based on the passage you have just heard.

单选题Small children can not ______ the different between right and wrong.

单选题Every living thing has what scientists call a biological clock that controls behavior. It tells plants when to (62) flowers and insects when to leave protective cocoon (茧)and fly away. And it tells animals and human beings when to (63) , sleep and seek food. It controls our body temperatures, the (64) of some hormones and even dreams. Events (65) the plant and animal affect its actions. Scientists recently found that a tiny animal called Siberian hamster changes the color of its (66) because of the number of hours of (67) In shorter days of winter its fur becomes white. The fur becomes gray-brown in longer (68) of daylight in summer. (69) signals control other biological clocks. German scientists found that some internal one seems to order birds to begin their (70) flights two times each year. Birds prevented from flying become (71) when it is time for the trip. (72) they become calm again when the time of the flight has ended. A mix of outside and internal events controls some biological clocks; such things as heartbeat and the daily change from sleep to walking take place because of both external and internal signals. Scientists are beginning to learn (73) parts of the brain contain the biological clocks. A researcher at Harvard University, Dr. Martin Moore Ede, said a small group of cells near the front of the brain seemed to control the (74) of some of our actions. Probably there are other cells to control other body activities. He is studying (75) they affect the way we do our work. Most of us have great difficulty if we (76) often change to different work hours. (77) can take many days for a human body to (78) a major change in work hours. Industrial officials should have a better (79) of biological clocks and how they affect workers. He said such an understanding could (80) sickness and accidents at work, and would help increase (81) .

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单选题Reebok executives do not like to hear their stylish athletic shoes called "footwear for yuppies". They contend that Reebok shoes appeal to diverse market segments, especially now that the company offers basketball and children's shoes for the under-18 set and walking shoes for older customers not interested in aerobics or running. The executives also point out that through recent acquisitions they have added hiking boots, dress and casual shoes, and high-performance athletic footwear to their product lines, all of which should attract new and varied groups of customers. Still, despite its emphasis on new markets, Reebok plans few changes in the upmarket (高档消费人群的)retailing network that helped push sales to $ 1 billion annually, ahead of all other sports shoe marketers. Reebok shoes, which are priced from $ 27 to $ 85, will continue to be sold only in better specialty, sporting goods, and department stores, in accordance with the company' s view that consumers judge the quality of the brand by the quality of its distribution. In the past few years, the Massachusetts-based company has imposed limits on the number of its distributors (and the number of shoes supplied to stores), partly, out of necessity. At times the unexpected demand for Reebok' s exceeded supply, and the company could barely keep up with orders from the dealers it already had. These fulfillment problems seem to be under control now, but the company is still selective about its distributors. At present, Reebok shoes are available in about five thousand retail stores in the United States. Reebok has already anticipated that walking shoes will he the next fitness-related craze, replacing aerobics shoes the same way its brightly colored, soft leather exercise footwear replaced conventional running shoes. Through product diversification and careful market research, Reebok hopes to avoid the distribution problems Nike came across several years ago, when Nike misjudged the strength of the aerobics shoe craze and was forced to unload huge inventories of running shoes through discount stores.

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单选题Responding to emerging diseases such as SARS is______ to responding to a bioterrorist attack in which they resemble a sudden appearance of an agent spreading in, a population.