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If we view a science as a body of systematized knowledge, then chemistry is usually called a natural science because it (26) knowledge of the natural world. At times we may wonder (27) there is no complete system (28) all of chemistry fits perfectly. Gaps in the present system, however, show that chemistry is still a(n) (29) subject and that we (30) all of its facts, laws, and theories. (31) , chemistry as a science is very much (32) us today, and its future holds the bright promise (33) much more to come. Man’s knowledge about himself and nature has grown into (34) sciences. The growth of the separate sciences has been more developmental than intentional. The separation of the natural sciences into physical and biological sciences, and physical sciences into physics and chemistry, happily (35) a larger body of knowledge into more manageable parts. At the same time we should remember that the concepts, techniques, and applications of the various sciences are interdependent and not exclusively a part of one science or (36) . In this (37) , chemistry is a key science among the natural sciences because everyone, (38) the area of natural science he wishes to pursue, needs at least an introduction to the principles and simpler applications of chemistry as a foundation for his specialty. Chemistry deals with the (39) of matter, changes in matter, the laws and principles (40) these changes, and the concepts and theories that interpret them.
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If we view a science as a body of systematized knowledge, then chemistry is usually called a natural science because it (26) knowledge of the natural world. At times we may wonder (27) there is no complete system (28) all of chemistry fits perfectly. Gaps in the present system, however, show that chemistry is still a(n) (29) subject and that we (30) all of its facts, laws, and theories. (31) , chemistry as a science is very much (32) us today, and its future holds the bright promise (33) much more to come. Man’s knowledge about himself and nature has grown into (34) sciences. The growth of the separate sciences has been more developmental than intentional. The separation of the natural sciences into physical and biological sciences, and physical sciences into physics and chemistry, happily (35) a larger body of knowledge into more manageable parts. At the same time we should remember that the concepts, techniques, and applications of the various sciences are interdependent and not exclusively a part of one science or (36) . In this (37) , chemistry is a key science among the natural sciences because everyone, (38) the area of natural science he wishes to pursue, needs at least an introduction to the principles and simpler applications of chemistry as a foundation for his specialty. Chemistry deals with the (39) of matter, changes in matter, the laws and principles (40) these changes, and the concepts and theories that interpret them.
[听力原文]As the car industry develops, traffic accidents have become as familiar as the common cold. Yet their cause and control remain a serious problem that is difficult to solve.Experts have long recognized that this discouraging problem has multiple causes. At the very least it is a problem that involves three factors: the driver, the vehicle and the roadway. If all drivers exercised good judgment at all times, there would be few accidents. But this is rather like saying that if all people were honest, there would be no crime. Improved design has helped to make highways much safer. But the total of accidents continues to rise because of human failure and an enormous increase in the number of automobiles on the road. Attention is now turning increasingly to the third factor of the accident, that is, the car itself. Since people assume that the accidents are bound to occur, they want to know how cars can be built better to protect the drivers. What remains an important factor for the rising number of road accidents（）
SECTION C NEWS BROADCASTQuestion 21-22 is based on the following news from the BBC or the VOA. At the end of the news item, you will be given 10 seconds to answer the two questions.Now listen to the news. Under the 1994 agreement. North Korea would ______.
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