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certain methods and procedures to obtain new knowledge and greater understanding. Although the methods are not always the same, there are usually certain elements in the procedures that are similar. 1. ( ) Problems must first of all be recognized. The right answers can be obtained only if the right questions are asked. A thoroughly understood problem is well started toward solution. Problems arise in a variety of ways. Sometimes they grow out of a chance observation. They may result from reading, from laboratory experiments, or simply from thinking. They also may result from new developments or from new or different human needs. Today, for example, problems are arising from new discoveries in the fields of nuclear physics, biological engineering and microelectronics. The development of industry has also brought about large numbers of problems which have to be solved. 2. ( ) Next, the scientist tries to learn as much as possible about it. Often this means going to the library and studying books which contain accounts of man's experience and knowledge of the problem. This is called searching the literature. The scientist may find that others have already solved all or a part of the problem. Occasionally he finds answers to closely related questions, which give clues for solving the new one. In his search the scientist accumulates much background information. With these new ideas and facts he builds a firm foundation for solving the problem. 3. ( ) After the scientist has finished this part of his work he will probably take the many facts which he has collected and organize them into some kind of system. This may be a logical classification or it may be a mathematical analysis. Usually the analysis will show unanswered questions. Sometimes it will suggest areas that are in need of further study. Perhaps one of the most important results of such an analysis is that it indicates certain truths, which generally are called inferences. 4. ( ) In making an inference the scientist has built up a hypothesis. A hypothesis is only a"best" guess. It must next be tested. If it is correct, the certain things should follow. This means if a particular experiment is carried out, certain observation ought to be possible or it should be possible to make certain predictions. Should the observations or predictions turn out to be as expected, the scientist has added confidence in the probable truth of his hypothesis. If, however, observations cannot be made or the predications are unreliable, then the hypothesis will probably be given up or at least modified. 5. ( ) The hypothesis must check with the facts. Scientific facts are usually established by work in the laboratory. Experiments have to be made under carefully controlled conditions. Thorough and accurate records must be kept. In making certain kinds of experiments in science variables are used. A variable is something which has different values under different conditions. In one type of laboratory test all the variables but one are controlled. This method of testing is called controlled experimentation. |
B. present the main idea of the passage
C. prove the content of the passage is true
D. explain why modern technology is stupid
B. early adopters are probably welcomed by the tech companies
C. Mecca (para. 2) is a place where new digital cameras are designed
D. all the early adopters are very rich and enjoying buying anything new
B. What he buys proves useless and expensive.
C. He finds himself no longer the most fashionable.
D. What he buys doesn’t eventually become popular.
B. Because he had to buy another new camera in several years anyway.
C. Because the old camera made him feel upset and out of fashion.
D. Because early digital cameras were of poor quality and couldn’t last long.
B. Doubtful.
C. Critical.
D. Ashamed.
B. early adopters bravely spend much money buying new technology
C. early adopters are as a matter of fact clever investors of technology
D. early adopters help promote the development of technology
B. hard to understand
C. available at the beginning
D. designed to test people's ability of understanding
B. is not a process of storage
C. is not a process of restorage
D. will be mature with the help of sleep
B. The brain will change those important unstable memories into stable.
C. Once the memory become stable, it will never become unstable again.
D. Sleep can protect memories from being harmed