9.分析与解答：答案为B，推理题。在文中第三段第三句，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，可以重新强调了，可见B)为正确答案。
10.分析与解答：答案为D，细读最后一段“Many chapters are, of course, inherently sequential in nature, but within this general limitation instructors should be encouraged to select among the contents those chapters that fit their needs, omitting material that is not relevant for the objectives of a particular course”，可知D)为正确答案。而A)，B)和C)在文中均未提及。
11.分析与解答：文章第二段提到Phillip Lobel的发现，接着几段描述了他是如何记录下鱼的声音的，即证明自己的发现，所以应选B。
12.分析与解答：第三段第二句话提到“The toadfish......for its low call, which can be heard even above water.”所以应选D。
13.分析与解答：应把第一段、二段、五段联系起来回答这个问题，特别是第五段第一句话提示我们答案应为D。
14.分析与解答：文章第四段第一句话提到“hamletfish switches roles from one tryst(约会)to the next。”故答案为D。
15.分析与解答：文章末段第二句写的是“like some birdcalls.”，目的是以鸟叫说鱼叫，所以答案应选D。
16.分析与解答：答案为B，推理题。综观全文，尤其是从最后一段第一句中的“In designing this edition, the Wadsworh editors and I have tried to respond to these developments…”可推知，本文是某部天文学著作的导言部分，故选B)，而A)，C)及D)与原文内容不符。
17.分析与解答：答案为A，推理题。根据第一段倒数第二“Astronomy has broadened to involve our basic circumstances and our mysterious futere in the universe”可推知，第一段的作用在于提供天文学发展的历史背景和现在发展的新特点，故选A)。而B)与原文明显不符；C)原文未提及；D)中的论述虽然与原文第一段第一句的后半部分“an astronomy book published today enters a worl different from the one that greeted books a generation ago”相符，但这仅是文中的细节，而不能概括整段的意思。
18.分析与解答：答案为D，细节题。根据第一段最后一句“…an outward exploratory thrust that may one day be seen as an alternative to mindless consumerism, ideological bickering, and wars to control dwindling resources on a closed, finite Earth”，可以看出正确答案为D)。其他选项与原文明显不符。
19.分析与解答：答案为D，根据第二段“Today's astronomy students not only seek an up-to-date summary of astronomical facts:they ask, as people have asked for ages, about our basic relations to the rest of the universe. They may study astronomy partly to seek points of contact between science and other human endeavors: philosophy, history, politics, environmental action, even the arts and religion”，可以看出正确答案为D)。其他选项与原文明显不符。
20.分析与解答：答案为A，细节题。选项B)与第三段第二句“Today's students are citizens of a more real, more vast cosmos than conceptualized by students of a decade ago”相符；C)与第一段最后一句中的“…astronomy offers adventure for all people, an outward exploratory thrust that may one day be seen as an alternative…”相符；而D)与第二段第一句“Today's asfronomy students not only seek an up-to-date summary of astronomical facts”明显相符。而A)原文未提及，故选A。
