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  3. 　　Usually, there are two reasons to pursue scientific knowledge: for the sake of the knowledge itself, and for the practical us

　　Usually, there are two reasons to pursue scientific knowledge: for the sake of the knowledge itself, and for the practical us

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问题 　　Usually, there are two reasons to pursue scientific knowledge: for the sake of
the knowledge itself, and for the practical use of that knowledge.
Because this second aspect of science effects the lives of most people,                  【S1】________
it is much more familiar than the first. Knowledge must be gained,
however, after it can be applied, and often the most important technological             【S2】________
advances arise from research pursued for its own sake.
    Traditionally, new technology has concerned with the construction                    【S3】________
of machines, structures, and tools in a relatively large scale. The                      【S4】________
development of materials for building bridges, skyscrapers or highways
is an example of this, as it is the development of the internal-combustion               【S5】________
engine and the nuclear reactor. While such activities involve all sections
of the sciences, the overriding goal has been the same, that is, improve                 【S6】________
the human condition by finding good ways to deal with the macroscopic                    【S7】________
world.
Since World War II, the focus of technological activity underwent a major
change. While the old activities are still pursued, they have been largely
superseded by applications of technology at the microscopic level. Instead
of building large-scale structures and machines, modern-day
technology tends to concentrate on finding improving ways to transfer                    【S8】________
information and to develop new materials by studying the way atoms come together.
The silicon chip and microelectronics typify this new technological
trend, as did the blossoming of genetic engineering. The trend can be                    【S9】________
expected to continue for the foreseeable decades.                                        【S10】________   
【S1】
选项
答案effects→affects
解析 易混淆词误用。本行句子的主语为this second aspect，指代上文的practical use(实际应用)，而谓语effect意为“使发生，引起”，与宾语“大部分人的生活”在搭配上意思不通，由此可知应改effect为affect“影响”，即知识“影响”生活。
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