Science is based upon observation. However, observation【C1】______is not science. Scientists generally state a problem. Then【C2】_

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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 is 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.
Observations 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.
【C17】

选项 A、it
B、these
C、this
D、that

答案B

解析考查代词。用these来指代上文的observations和measurements。

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