A. fact B. continuously C. ignore D. when E. much F. shows G. prevented

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问题 A. fact B. continuously C. ignore D. when E. much
F. shows G. prevented H. plays I. limited J. unconsciously
K. data L. unpredictable M. tools N. attend O. because
In recent decades, scientists have become increasingly aware of the part the observer 【C1】______ in the scientific process. In the first place, the observer can work only with his experiences, and these are【C2】______ by his senses and the instruments he uses to extend his senses. Ultraviolet light, electromagnetic fields, and atomic particles, for example, became known to us only as we devised【C3】______ with which we could observe their effects. Consequently, our picture of the real world is always incomplete.
Secondly, the observer is highly selective in choosing his【C4】______. Life is a narrative of ever new and often【C5】______ events. At any given moment, an individual is bombarded with sense experiences and can, if he desires, expose himself to more. But he is really interested in or concerned with only a few of these. Other experiences are consciously or【C6】______ screened out as irrelevant to the task at hand. For example, as we read a book, we are often surrounded by sounds and activities that we【C7】______, but by turning our attention to them we become conscious of their presence. What a scientist discovers depends, to a great extent, on what he is looking for— on the questions he is asking. Thus, academic disciplines differ in their study of human beings in large part【C8】______ they ask different questions.
Human beings live, so to speak, in a house with only a few windows of tinted and curved glass, through which we see the outside world. The glass colors and distorts our observations, and its effects can be determined only with【C9】______ difficulty. Scientists are increasingly aware of the 【C10】______ that they work with sense data, not with the world itself. [br] 【C1】

选项

答案 H

解析空格处需填入动词第三人称单数作定语从句的谓语。主语为观察者，定语从句修饰the part，part在句中是“角色，作用”的意思，相当于role，动词plays符合要求。

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