英語作文Reading Comprehension

　　Reading Comprehension

　　Time: 55 minutes (including the reading of the directions). Now set your clock for 55 minutes.

　　Questions 1-9

　　In science, a theory is a reasonable explanation of observed evnets that are related.

　　A theory often involves an imaginary model that helps scientists picture the way an

　　obseved event could 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 theoty, in addition to explaining past observations, helps to predict events

　　that have not as yet been ovserved. After a theory has been publized, 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 thenselves 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 avout a particular problem. After kmown 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 extents the scientist s

　　thinking beyond the known facts. The scientist plans experiments, perform

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