重点讲解：
36. eventually
解析：此处需要一个副词，eventually“最终”，经常用于引出结果。
37. sustain
解析：此处需要一个原形及物动词，sustain是四六级核心词汇，此处表示“供给必需品及营养”。
38. trends
解析：根据谓语动词的形式，此处的主语应该是名词的复数形式，trends “趋势”。
39. feeding
解析：此处用动名词作介词宾语，意为“喂养”。
40. crowded
解析：此处需要一个形容词作定语，crowded“拥挤的”。
41. exhausted
解析：此处用过去分词表被动，注意不要漏掉h。
42. atmosphere
解析：此词虽长，但是较常见，且根据发音规则还是不难写的，注意/f/音是由字母组合ph而来的。
43. tiny
解析：根据前面的only，可以推测此形容词强调数量之少。不可错写成tidy。
44. 标准答案：Sagan proposes that algae, organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus
听音关键：propose，algae，organisms，live，hot or cold，produce oxygen，be bred，similar，Venus
答案重构：Sagan proposes that algae, organisms living in extremely hot or cold atmospheres and producing oxygen, be bred in conditions similar to those on Venus
画龙点睛：Segan，algae和Venus在上下文中都出现过，不应成为障碍性的词。两个逗号之间是algae的同位语。should型虚拟语气的宾语从句中should可以省略。
45. 标准答案：Spaceships will then fly to Venus and fire the rockets into the atmosphere
听音关键：Spaceships，fly to Venus，fire rockets
答案重构：Spaceships will then fly to Venus and launch rockets into the atmosphere
画龙点睛：此句较简单，基本上不必改写。注意短句尽量不要漏掉任何一个单词。
46. 标准答案：The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like Earth will be reproduced on Venus
听音关键：surface，too hot to land，rain fall，sth. like Earth，reproduced on Venus
答案重构：Man can't land on it when its surface is still too hot but the rain will eventually fall and in a few yars Venus will turn to be like Earth
画龙点睛：根据前一句可以将转折之前的内容改写成以man为主语的结构。