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单选题 Power plants that generate electricity by means of atomic energy are in operation in several countries. Scientists hope to solve many of the problems in the use of atomic energy, and many scientists now believe that atomic energy will be the most important source of electric power ______
学科：工程学科英语
时间：2024-04-26 04:23:09
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题目1单选题
Copper is a fairly soft metal and is easily shaped even when it is cold. It was one of the first metals used in making tools. Copper relics have been found that are older than recorded history. Copper is more extensively used than any other metal except iron. Fortunately, it is not ______A. malleableB. availableC. expensiveD. plentiful
题目2单选题
A manikin made of plastic and metal has been placed in a mechanical seat and subjected to a simulated car collision. The manikin is wired electronically to report the results of the crash. This equipment has aided in the production of better protective devices to minimize the bad effects of accidents. You may some day owe your life to ______A. a signalB. an automobileC. an accidentD. a dummy
题目3单选题
Wood is a readily available and beautiful building material that is preferred by many for home construction. Fire insurance rates on wooden houses are higher than on brick houses or houses made of some other materials. One chemical company advertises a wood treated with noncombustible chemicals. At temperatures below the ignition point of wood, the chemicals react to produce carbon dioxide and water, which choke flames and prevent the spread of fire. In a sense, the treated wood has a ______A. low cost per unitB. built-in fire extinguisherC. beauty greater than woodD. number of construction uses
题目4单选题
Iron is of prime importance in tool making, weaponry, transport facilities, construction, and machinery. Because of its unmatched magnetic properties, iron provides the cores that are used in all electric generators, and the production of electricity on any large scale would be impossible without it. Although gold, silver, and some other metals cost more and are also used in industry, iron is the most ______A. dispensableB. expensiveC. vitalD. rare
题目5单选题
The uses of water are increasing rapidly, and there is cause for concern. One hopeful area of research in providing more water is in ______A. removing salt from sea waterB. better weather reportingC. snow surveysD. lowering water cost
题目6单选题
There are vast stretches in southern Italy where there used to be nothing but a few shepherds' huts. In this region, there are now high chimney stacks, large water tanks, large cranes, and other paraphernalia of modern factories. Southern Italy has become ______A. internationalizedB. industrializedC. class-consciousD. democratic
题目7单选题
The preparations for sending an animal into a place were very elaborate. Such a project was not attempted until the scientists were sure that they had taken care of every detail and that the risk to the animal in flight was ______A. fearedB. providedC. minimalD. concerned
题目8单选题
Magnesium, a very useful metal, is abundant in the earth. The greatest source of magnesium, however, is not the earth but the oceans. Processes have been developed to economically extract magnesium from seawater. This makes the valuable metal readily available to countries that border the oceans. Magnesium is available to most countries either from the sea or from the ______A. oceansB. landC. riversD. mountains
题目9单选题
Power plants that generate electricity by means of atomic energy are in operation in several countries. Scientists hope to solve many of the problems in the use of atomic energy, and many scientists now believe that atomic energy will be the most important source of electric power ______A. in the futureB. when it is triedC. in the laboratoryD. in the army
题目10单选题
Signaling by sound is an old practice. Primitive tribes gave warnings and other signals by means of drums. Certain vehicles, such as some police cars, fire engines and ambulances, use a siren to warn other cars to clear the way for them. Ships travelling through fog use sound signals to prevent ______A. groundingB. piracyC. speedD. collisions
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