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The author does not include among the sciences the study of Why is electrical technology mentioned in the third paragraph?

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问题 The author does not include among the sciences the study of
Why is electrical technology mentioned in the third paragraph?
选项 A、To confirm its importance in the modern world.
B、To show the powerful influence of its inventions.
C、To verify the usefulness of theoretical knowledge.
D、To give an example of success in practical science.
答案C
解析 逻辑结构题。本题问：为什么第3段中提到电气技术?第3段第1句是段落主题句，它写道："但是即使人类在享受技术进步的成果时，他也必须维护理论知识的首要性和自主性"。这是本段的论点。接着作者以对圆锥体和电的理论研究来证明理论知识的有用性，即理论科学是应用科学的基础。其他选项之所以不能入选是因为仅仅属就事论事、偏离主题，或没有说明论据与论点之间的逻辑关系。
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