Suppose that this evening a spaceship from somewhere outside the solar system landed unnoticed in your neighborhood. Suppose you saw three beings from that ship walk down the road in front of your house at dusk. Would you run screaming to the telephone to call the police? No, the chances are that you wouldnt even give them a second look.
We can be almost certain that our visitors from space will not have three eyes, webbed feet, or television antennae growing out of their foreheads. Instead, scientists theorize, they will probably bear a strong resemblance to the man next door.
The reason we can make this assumption is that science has shown that the shape of a living body is not accidental.
There are rules of biological construction that help us picture presumed visitors before they actually step out of their spaceship.
In applying the rules, we have to make just two assumptions. The first is that the bodies of spacemen consist of protoplasm like ours. The second is that they are intelligent, which is an inescapable fact once we accept the idea that they are capable of building a spaceship.
With those assumptions in mind, we can paint this portrait of the man from Planet X. :
He breathes air. Water breathers might develop some intelligence, but they could not smelt metals under water. This means that any development above the level of our own Stone Age is the accomplishment of air breathers.
He eats both plants and meat. A strict plant-eater spends too much time stuffing himself with food to build the kind of civilization which is necessary to produce a spaceship. Animals which can digest meat only would not be likely to survive the occasional adverse periods which very likely occur on all planets and wipe out the less adaptable forms of life.
Hes probably not much larger than the largest human being. The limiting factor here is something called the spare-cube law. If you double the height of a, person without changing his proportions, you have a being with weight times the weight. This means that a person 12 feet tall, for example, must be clumsy and cannot perform precision work. And precision work will be essential, of course, in building the spaceship.
He weighs at least 40 pounds, and probably more. A brain of a certain size and complexity would be required for the building of a spaceship. The brain of our spacemen would weigh at least 2 pounds.
提高面试英语有绝招
口语8分的练习方法
雅思口语8分:可望可即(下)
口语考试的时间确认规律
雅思口语分类词汇大全1
澳洲常考的37个口语TOPIC
香香妹的口语7分战役(上)
口语提高完全攻略
考官谈口语:中国服装-旗袍
IELTS口语考试技巧攻略
口试当聊天 雅思考8.5分
口语第二部分如何知道时间是否达到要求
雅思口试 中国的孩子们到底缺什么?
练口语要准备自己的“句子库”
雅思口语高分三要诀
雅思口语9分详细过程回忆
雅思口语成绩是当场评还是根据录音评
考官谈口语:工艺品-竹艺
雅思口语考试临场发挥的两大新思路
名师指导帮你推翻雅思口试复习两座大山
雅思最近常见话题的考试准备
口语考试准备技巧
一个月准备口语八分感想
雅思口语答题参考:Restaurant
口语话题剖析雅思口语常见话题剖析
口语素材:用英语打电话的N种说法
雅思口语复习备考经验(推荐)
雅思口语考试反映国内英语教育缺陷
雅思口语答题参考:natural scenery
专家谈突破雅思考试口语四大招
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |