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| 文章出处：学生大考试站 发布时间：2005-10-12 |
ers to which of the following?
A) Problem. B) Material.
C) Difficulty. D) System.
25. Which of the following statements best explains why “the second of these was the more serious impediment”(Underlined)?
A) Chemical knowledge was limited to a small number of people.
B) The symbolic language used was very imprecise.
C) Very few new discoveries were made by alchemists.
D) The records of the chemical processes were not based on experiments.
Passage Two
Questions 26 to 30 are based on the following passage:
An important new industry, oil refining, grew after the Civil War. Crude oil, or petroleum a dark, thick ooze from the earth had been known for hundreds of years, but little use had ever been made of it. In the 1850’s Samuel M. Kier, a manufacturer in western Pennsylvania, began collecting the oil from local scapages and refining it into kerosene. Refining, like smelting, is a process of removing impurities from a raw material.
Kerosene was used to light lamps. It was a cheap substitute for whale oil, which was becoming harder to get. Soon there was a large demand for kerosene. People began to search for new supplies of petroleum.
The first oil well was drilled by E. L. Drake, are tired railroad conductor. In 1859 he began drilling in Titusville, Pennsylvania. The whole venture see
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