[外语类试卷]考博英语模拟试卷61及答案与解析.doc
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1、考博英语模拟试卷 61及答案与解析 一、 Reading Comprehension 0 Microwaves are a type of electromagnetic radiation; they are a very mild form of electrical or magnetic wave that moves through space. Unlike X-rays and gamma rays, which are very powerful rays of radiation, microwaves are rather weak and are much more li
2、ke the waves of radiation used in radio broadcasting. In microwave ovens, the use of microwaves with which most people me familiar, the waves are produced by an electronic tube called a magnetron. Microwaves produce heat in any food placed inside the oven by causing the water in the food to vibrate
3、rapidly and thus heat up. Food that have more water in them take less time to cook and probably have more of their nutrients left intact when cooked in a microwave oven. Microwaves do not pass through metal, so the microwaves are retained within the oven. Microwaves pass immediately through glass, p
4、aper, and plastic with no effect on these materials or on the microwaves; nothing inside the microwave oven is heated except the food itself, so cooking process is much more efficient than in conventional ovens. Sometimes a pan or container is heated because it is touching the hot food, though: some
5、 users of microwave oven have been burned by but food, by hot pans, or steam escaping from the food. No documented case of radiation burns born a microwave oven has ever been reported. Actually, we know very little about how microwave radiation might affect human beings. Obviously, if microwave can
6、cook a roast by exciting the water molecules in the meat, they could do the same thing to human flesh. Human being could be burned by prolonged exposure to high levels of microwaves. But scientists are more concerned about the effects of low level microwave exposures, such as might result from a lea
7、king microwave oven. No research has yet been performed on people who have been exposed to low level microwave radiation. Some experiments have been performed on animals, but the results are very difficult to interpret. As the eyes are particularly sensitive, rabbits exposed to low level microwaves
8、were checked for the growth of cataracts, and none were found. On the other hand, some animals seem able to sense microwave radiation and try to escape from it immediately. In others, microwave radiation causes the body to react as if defending itself against a decease. These responses lead some sci
9、entists to think that microwave radiation is harmful, though in some yet undiscovered way. 1 The purpose of this passage is to discuss _. ( A) the beneficial use of microwaves ( B) the harmful effects of microwaves ( C) the modern methods of cooking ( D) the use and possible harmful effects of micro
10、waves 2 Microwaves are _. ( A) absolutely safe at low levels ( B) very efficient for cooking ( C) cancer-causing iii people with weak eyes ( D) completely understood by scientists 3 We can conclude from this passage that _. ( A) the heat created in microwave ovens is very difficult to control ( B) f
11、ood tastes better when cooked in a microwave oven ( C) food cooked in microwave ovens is probably more nutritious than food cooked in more conventional ways ( D) most research on the effects of microwaves on human beings has been restricted to the study of low level microwave radiation 4 The author
12、s tone is _. ( A) objective ( B) sarcastic ( C) negative ( D) skeptical 5 As used in the 3ut paragraph of this passage, the word “documnted“ means _. ( A) numbered ( B) recorded ( C) legal ( D) believable 5 Two system of weights and measures exist in the U. S. today: the U. S. Customary System and t
13、he International System of Units (IS, after the initials of International System). IS, commonly referred to as the metric system, is actually a more complete, coherent version of it. Throughout U. S. history, the Customary System (inherited from, but now different from, the British Imperial System)
14、has been customarily used; a plethora of federal and state legislation has given it, through implication, standing as the primary weights and measures system. The metric system, however, is the only system that Congress bus ever specifically sanctioned. An 1866 law reads: It shall be lawful througho
15、ut the United States of America to employ the weights and measures of the metric system; and no contract or dealing or pleading on any court, shall be deemed invalid or liable to objection because the weights or measures expressed or referred to therein are weights or measures of the metric system.
16、Since that time, use of the metric system in the U. S. has slowly and steadily increased, particularly in the scientific community, in the pharmaceutical industry, and in the manufacturing sectorthe metric system is now predominantly used. On Feb. 10, 1964, the National Bureau of Standards (now know
17、n as the National Institute of Standards and Technology) issued the following bulletin: Henceforce it shall be the policy of the National Bureau of Standards to use the units of the International system (iS), as adopted by the 11th General Confference on Weights and Measures (October 1960), except w
18、hen the use of these units would obviously impair communicator or reduce the usefulness of a report. On Dec. 23, 1975, Pres. Gerald R. Ford signed the Metric Conversion Act of 1975. It defines the metric system as being the International System of Units as interpreted in the U. S. by the secretary o
19、f commerce. The Trade Act of 1988 and other legislation declare the metric system the preferred system of weights and measures for U. S. trade and commerce, call for the federal government to adopt metric specifications, and mandate the Commerce Dept. to oversee the program, the conversion process i
20、s currently underway: however, the metric system has not become the system of choice for most American daily use. The following seven units serve as the base for the International System: length-meter; masskilogram; time second; electric current-ampere; thermodynamic temperature-kelvin; amount of su
21、bstance-mole; and luminous intensity-candela 6 Two systems of weights and measures used in the U.S. are _. ( A) the U. S. Customary System and the metric system ( B) the International System and the metric system ( C) the Imperial System and the metric system ( D) the Customary System and the Imperi
22、al system 7 Which of the following state statements is NOT true? ( A) The Customary System originated from the British Imperial System. ( B) The Customary System has just been used in daily time. ( C) The metric system was specifically sanctioned by Congress in 1866. ( D) From 1964, using the units
23、of the International System has been the policy of the National Bureau of Standards. 8 Which of the following is a true statement? ( A) Since 1866, use of the metric system in the U.S. has been increasing. ( B) Since 1988, the metric system has been the preferred system of weights and measures for U
24、.S. trade and life. ( C) In 1988, Congress passed a law to prevent the use of the Customary System in trade and commerce. ( D) On Dec. 23, 1975, Pres. Gerald R. Ford signed the Metric Conversion Act of 1975 to adopt the metric system in the U. S. 9 Which unit belongs to the Customary System? ( A) me
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