题目内容
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According to the passage, which one below is not the hot spots main function？
A．Measuring instrument of the continent movement.
B．A frame. of reference of the passage of plates.
C．To initiate the formation of new ocean.
D．To explain the mutability of the continents.
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A Doctors will be held guilty if they risk their patients'death.
B Modern medicine has assisted terminally ill patients in painless recovery.
C The Court ruled that high-dosage pain-relieving medication can be prescribed.
D A doctor's medication is no longer justified by his intentions.
A、be keen on
B、be crazy about
C、be fond of
D、be rather more interested in
A、He must avoid the evil contact.
B、He needs help from another powerful supernatural being.
C、He must draw a sandpainting.
D、He must sing at a ceremony.
A、not to allow others to use it freely
B、to harm the patient
C、not to harm others
D、to protect the patient
A、They are sand paintings.
B、They attract supernatural beings.
C、They have healing powers.
D、All of the above.
In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion. A useful theory, in addition to explaining past observations, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists’ predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the theory may have to be revised or rejected. Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said: “Science is built with facts just as a house is built with bricks, but a collection of facts cannot be called science any more than a pile of bricks can be called a house.” Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses. In a way, any hypothesis is a leap into the unknown. It extends the scientist’s thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are conformed, they are incorporated into theories. According to the passage, a useful theory is one that helps scientists to ________.
A、find errors in past experiments
B、make predictions
C、observe events
D、publicize new findings
A、Shifting through known facts.
B、Communicating a scientist’s thoughts to others.
C、Providing direction for scientific research.
D、Linking together different theories.
At the bottom of the world lines a mighty continent still wrapped in the Ice Age and, 31 recent times, unknown to man. 32 of the continent is a complete blank on our maps, A 1,000-mile stretch of the coastline has never been 33 by a ship. Man has explored, on foot, less than one per cent of its area. Antarctica differs fundamentally 34 the Arctic regions. The Arctic is an ocean, covered with d 35 ice and surrounded by the land masses of Europe, Asia, and North America. The Antarctic is a continent almost as large as Europe and Australia c 36 , centered roughly on the South Pole and surrounded by the most u 37 water areas of the world—the Atlantic, Pacific, and Indian Oceans. The continental ice sheet is more than two miles 38 in its center; thus the air over the Antarctic is much colder than it is 39 the Arctic regions. More than a million persons live within 2,000 miles of the North Pole in an area that includes most of Alaska, Siberia, and Scandinavia—a region rich 40 forest and mining industries. Apart from a handful weather stations, within the same distance of the South Pole is not a single tree, industry or settlement.
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