Passage Three
In a way, all of us are on a spaceship-the planet Earth. [33]We move around the sun at 18 miles per second and never stop. [32]On our spaceship, we have 5 billion people and limited supply of air, water and land. These supplies have to be used carefully because we can't buy new air, water or land from anywhere else. Environment on our planet is a closed system. [34]Nothing new is ever added. Nature recycles its resources. Water, for example, evaporates and rises at visible drops to form clouds. The same water returns to the earth as rain or snow. The rain that falls today is actually the same water that fell on the land 70 million years ago. Today, the earth is in trouble. Factories pour dirty water into rivers, many fish die and water becomes unhealthy for people to drink. Cars and factories put poisons into the air and cause plants, animals and people to get sick. People throw bottles and paper out of their car windows and roadside becomes covered with all sorts of wastes. Over the years people have changed environment and we have pollution. [35]To continue to survive, we must learn how to use the earth resources wisely. We have to change our habits and stop dropping such enormous amounts of industrial waste into the water and air. [35]We must cooperate with nature and learn better ways to use, not to abuse our environment.

Questions 32 to 35 are based on the passage you have just heard.
32. Why does the speaker compare the earth to a spaceship?
正确答案：A
解析：短文开篇便将地球比作了spaceship，然后说上面的空气、水、土地资源都很有限，因此答案为A。根据选项可以预测信息点是地球与宇宙飞船之间的相似处。答案中的关键词limited supply of air, water为文中原词。
33. How fast does the planet Earth travel around the sun?
正确答案：C
解析：选项之间的差异只是数字不同，发音两两相似，因此可注意辨别录音中出现的数字。此题本身并不难，因此提前浏览选项是十分重要的。
34. Why does the speaker advise us to use the earth resources wisely?
正确答案：D
解析：短文提到，这些资源必须谨慎使用，因为我们无法从别的地方买到新的空气、水或土地。所以D正确。从选项关键词可猜测题目和资源的减少有关，并且是问减少的原因。答案中的no... new在文中两次提及，关键词added也是文中原词。
35. What message is the speaker trying to convey?
正确答案：B
解析：答案B是对文章最后一句的同义表达。句型与原文一致。选项均与环境有关。环境问题是学生非常熟悉的话题，可用常识来排除干扰项。一般环境问题是人类与自然的问题，所以A排除；C明显不符合事实；D中用了eliminate（消灭）一词，估计没人会赞同这种说法。