[单项选择]At the international conference. the famous scientist gave an excellent report based on his recent experiment．（）
A. 在国际会议上，这位著名科学家根据他最近的实验结果做了精彩的报告。
B. 在国际会议上，这位著名科学家宣读了他最近实验的精彩报告。
C. 在国际会议上，这位著名科学家以他的精彩报告为基础，做了实验。
D. 这位著名科学家以最近的国际会议为基础，宣读了精彩的实验报告。

[单项选择]At the international conference, the famous scientist gave an excellent report based on his recent experiment.（）
A. 在国际会议上，这位著名科学家根据他最近的实验结果做了精彩的报告。
B. 在国际会议上，这位著名科学家宣读了他最近实验的精彩报告。
C. 在国际会议上，这位著名科学家以他的精彩报告为基础，做了实验。
D. 这位著名科学家以最近的国际会议为基础，宣读了精彩的实验报告。

[单项选择]Basic research provides the capital fund of scientific knowledge, on which the applied re searchers draw to give society a rich rate of interest.（）
A. 基础研究为科学知识提供资金，在其中让应用研究人员从中提取后回报社会。
B. 基础研究为科学知识提供资本基金，让应用研究人员从中提取给社会高利息。
C. 基础研究为科学提供资本金，应用研究人员也可以从中提取回报社会。
D. 基础研究为科学知识提供资本基金，让应用研究人员从中提取后以高利率回报社会。

[单项选择]Alexis de Tocqueville, the French political scientist, historian, philosopher and politician, is most famous for a four-volume book he wrote called Democracy in America. He came to America in 1831 to study the American form of democracy and what it might mean to the rest of the world. After a visit of only nine months, he wrote a remarkable book which is regarded as a classic. Tocqueville had unusual powers of observation. He described not only the democratic system of government and how it operated, but also its effect on how Americans think, feel, and act. Many scholars believe he had a deeper understanding of traditional American beliefs and values than anyone else who has written about the United States. What is so remarkable is that many of these traits which he observed nearly 200 years ago are still visible and meaningful today. His observations are also important because the timing of his visit, the 1830s, was before America was industrialized. This was the era of the small far
A. The visit lasted only five months.
B. The visit coincided with American industrialization.
C. The first part was published in 1835; the second in 1840.
D. The second part was more optimistic than the first.