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  3. In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model

In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model

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问题     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 confirmed, they are incorporated into theories.
In the last paragraph, the author refers to a hypothesis as "a leap into the unknown" in order to show that hypotheses______.
选项 A、are sometimes ill-conceived
B、can lead to dangerous results
C、go beyond available facts
D、require effort to formulate
答案C
解析 本题是细节题。从题干中的关键词“a leap into the unknown”找到其定位原句“any hypothesis is a leap into the unknown”，接下来是对这一论点的深入陈述，即“It extendsthe scientist’s thinking beyond the known facts”(“假设”使科学家的思想可以超越已知事实)。由此可判断C正确。
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