This textbook lays stress on ______. The underlined words "conversely, however" (Para. 4) indicate that ______.

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问题 This textbook lays stress on ______.
The underlined words "conversely, however" (Para. 4) indicate that ______.

选项 A、many topics can be emphasized though they were not covered in the old edition
B、many topics can be emphasized though they were usually omitted by instructors
C、many topics have been added to the new edition as they were not covered in the old one
D、many topics have been added to the new edition though they can be omitted by the instructors

答案B

解析 在文中第三段末,作者谈到导师对本书的某些章节可根据个人需要而省略,在第四段中作者又说“many topics that were regarded a few years ago as of peripheral importance and were omitted from introductory courses have now come to the fore again in the life sciences, earth and space sciences, and environmental problems”,作者很显然在暗示某些导师习惯省略的话题现在又变得重要了,又需要重新强调了,可见B为正确答案。
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