[主观题] 【翻译】Pure copper wires have very low resistance , which is why they are so much used in electric circuit.

1、[主观题]【翻译】The absence of air also explains why the stars do not seem to twinkle in space．as they do from the earth．

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2、[主观题]【翻译】So far the people of the United States have experienced an ever—rising level of well being along with population increase．They have been able，by technological advances，a deepeningof capital investment，and greater training of the labor force，to make up for the exhaustion of some of the best natural resources as well as the mounting costs of increased population density．Since to provide increased goods and services for more people does require technological advances，capital investment，and skilled labor，there must be a point beyondwhich an increase in population leads to a lowering of real income and a decline in the level of well being．Thus it came to be said that when a population should experience in the long run an ever-falling supply of goods and services，per capita，it was no longer of best size．

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3、[主观题]【翻译】对那些你想要在以后几天、几周或几个月回想起来的材料，最佳的学习时间是下午。政治活动家、工商企业经理或其它必须牢记演讲词的人们，在下午这段时间里进行记忆将是明智之举。如果你是学生，那么，一个聪明的办法是把较难的课程安排在下午，而不是安排在上午去做。你应当力图把研读大部分功课的时间放在下午，而不是放在深更半夜。许多学生因为短期记忆的效果在凌晨比在下午好，就以为挑灯夜读能记得更牢。但短期记忆在他们几天以后面对考试时帮不了多大的忙。

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4、[主观题]【翻译】Pure copper wires have very low resistance , which is why they are so much used in electric circuit.

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5、[主观题]【翻译】Electricity which is passed through the thin tungsten wire inside the bulb makes the wire very hot.

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