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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superseded by applications of technology at the microscopic level.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】________   
【S5】
选项
答案it→it或as→and
解析 句法错误。原句的it指代上文提到的建桥。盖楼，筑路材料的发展，as充当连词，表原因。但本句的两个分句间显然不存在因果关系，as后面的部分应该只是补充说明前面的an example of this，此处的as应引导一个非限定性定语从句，由于as在从句中充当主语，多余的主语it需删除。或者把as改成连词and。
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