Marine archaeologists recently discovered underwater in an ancient Mediterranean harbor several hundred ceramic objects, dating back approximately 4,000 years. Although any remnants of a ships wooden frame. would have long ago decayed, the quantity and variety of the ceramics discovered in the initial investigation led the archaeologists to hypothesize that they had discovered an approximately 4, 000-year-old shipwreck. Which of the following, if true, gives the strongest support to the archaeologists hypothesis？
A. Marine archaeologists have discovered a 3, 000-year-old shipwreck in another ancient Mediterranean harbor.
B. The rate at which wood decays when submerged in water varies greatly with the type of wood involved.
C. Two confirmed shipwrecks, approximately 3,500 and 3,000 years old, respectively, have been discovered in the same harbor in which the ceramic objects were discovered.
D. The ceramics discovered in the harbor are similar to ceramics found in several other ancient Mediterranean harbors.
E. Bronze ship"s fittings, approximately 4,000 years old, were discovered on the seabed among the ceramic objects.
查看答案
Within the last fifty years, the majority of the United States work force has moved from the manufacturing to the service sector of the economy. This shift has occurred, not because of a decline in the production of goods, but because, with applications of new technology, more production of goods can now be achieved with relatively fewer people, and more people are therefore available to satisfy the increased demand for services. Which of the following, if true, provides evidence to support the claim made above that more production of goods can now be achieved with relatively fewer people？
A. Many manufacturing industries in the United States have lost a significant share of their domestic and foreign markets to foreign producers.
B. Services accounted for half of all jobs in the late 1940"s but today account for seventy percent of all jobs.
C. Manufacturing output was one-third higher in 1980 than in 1970, while manufacturing employment grew only five percent during that period.
D. Manufacturing industries, on average, pay a higher per-hour wage and use fewer part-time employees than do service industries.
E. Living standards in states that have shifted to manufacturing economies within the last fifty years are closer to the national average now than in 1940.
Since the routine use of antibiotics can give rise to resistant bacteria capable of surviving antibiotic environments, the presence of resistant bacteria in people could be due to the human use of prescription antibiotics. Some scientists, however, believe that most resistant bacteria in people derive from human consumption of bacterially infected meat. Which of the following statements, if true, would most significantly strengthen the hypothesis of the scientists？
Antibiotics are routinely included in livestock feed so that livestock producers can increase the rate of growth of their animals.
B. Most people who develop food poisoning from bacterially infected meat are treated with prescription antibiotics.
C. The incidence of resistant bacteria in people has tended to be much higher in urban areas than in rural areas where meat is of comparable quality.
D. People who have never taken prescription antibiotics are those least likely to develop resistant bacteria.
E. Livestock producers claim that resistant bacteria in animals cannot be transmitted to people through infected meat.
弧形切割法是以每一救生岗位为圆心，以小池I5M大池25M为半径切割水域，其水域各救生岗位的责任区。()
游泳救生员只要把溺水者救上岸即可，急救是医务人员的事情。()
微信支付 
支付宝支付