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  3. Science is based upon observation. However, observation【C1】_________is not science. Scientists generally state a problem. Then【C

Science is based upon observation. However, observation【C1】_________is not science. Scientists generally state a problem. Then【C

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问题         Science is based upon observation. However, observation【C1】_________is not science. Scientists generally state a problem. Then【C2】_________guides them in their observations. But without observation people generally are not【C3】_________of a problem. This then raises a question【C4】_________comes first, the observation or the problem. Curiosity awakens a【C5】_________for observation. Observation will usually【C6】_________specific questions in the mind of a scientist.【C7】_________his curiosity, he begins to make observations.【C8】_________he formulates a specific statement that can be tested. This statement is called a hypothesis, it’ s the starting point for an experiment.
        【C9】_________experimenting, the scientist tries to show or prove that the hypothesis is true【C10】_________false. He must use good【C11】_________to create an experiment that【C12】_________the problem. The experiment must produce【C13】_________information or data. The data gathered during the experiment are observations.
        Observation can be made directly and indirectly. For indirect observation, instruments are often used.【C14】_________instruments used by modern scientists are quite simple; others are very【C15】_________.
        To complete his experiment, the scientist must state his observations【C16】_________numerical form. This means that he has to make measurements. With the results from【C17】_________he can make more exact comparisons or descriptions to【C18】_________his hypothesis. The results of a scientific experiment【C19】_________on a logical hypothesis can often【C20】_________a better understanding of the world and the universe.
【C13】
选项 A、variable
B、vague
C、valid
D、various
答案C
解析 本题考查形容词辨析。A项意为“多变的”；B项意为“模糊的”；C项意为“有效的，有根据的”；D项意为“各种各样的”。结合语境，只有C项符合，本题选C。
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