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  3. If it were only necessary to decide whether (31) teach elementary science to everyone on a mass basis (32) to find the gifted fe

If it were only necessary to decide whether (31) teach elementary science to everyone on a mass basis (32) to find the gifted fe

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问题     If it were only necessary to decide whether (31) teach elementary science to everyone on a mass basis (32) to find the gifted few and take them as (33) as they can go, our task would be fairly simple. The public school system, however, has no such choice, for the jobs must be carried (34) at the same time. Because we depend so heavily upon science and (35) for our progress, we must produce specialists in many fields, because we live in a democratic nation, (36) citizens make the policies for the nation, large numbers of us must be educated to understand, (37) uphold, and (38) necessary, to judge the work of experts. The (39) school must (40) both producers and users of scientific services.
    In education, there should be a good balance (41) the branches of knowledge that contribute (42) effective thinking and wise judgment. Such (43) is defeated by (44) much emphasis on any one field. This question of balance involves not only the relation of the (45) sciences, the social sciences and the arts but (46) relative emphasis among the natural sciences themselves.
    Similarly, we must have a balance between current and (47) knowledge. The attention of the public is continually (48) to new possibilities in (49) fields and the discovery of new knowledge; these should not be allowed to mm our attention away (50) the sound, established materials that form the basis of courses for beginners.

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答案when
解析 在文章开头作者就用假设的手法提出了问题"if...whether...or"，而"when"表达的是对可能出现的某种情况的回答，即对"if"的假设问题的回答，所以填"when"。
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