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1、We have known for a long time that flowers of different plants open and close at different time of day, This is so familiar that there seems to be no need to ask the reason for it.Yet no one really understands why flowers open and close like this at particular times. The process is not as simple as
2、we might think, as recent experiments have shown. In one study, flowers were kept in constant （连续的）darkness. We might expect that the flowers, wi thout any information about the time of day,did not open as they normally do. In fact, they continued to open at their usual time. This suggests that they
3、 have some mysterious （奇怪的）way of knowing the time. Their sense of time does not depend on information from the outside world; it is, so to speak, inside them, a kind of a inner clock”.This discovery （发觉）may not seem to be very important. However, it was later found that not just plants but also ani
4、mals including man have this “ inner clock which controls the working of their bodies and influences （影响）their activities. Men, then, arc also influenced by this mysterious power. Whether we wish it or not, it affects such things in our life as our need for sleep, our need for food.In the past, this
5、 did not matter very much because people lived in natural condition. In the modern world, things are different: now there are spacemen, airplane pi lots and, in ordinary 1ife, a lot of people who have to work at night. It would be very useful, then,to know more about the “inner clock . Such ordinary
6、 things as flowers might help us understand more about ourselves.译文：长期以来，我们知道不同植物的花开放与闭合的时间各异.我们认为这是 理所当然的事，所以没有人深究.但没有人真正理解为什么花会在特定的 时候开放与闭合.最近的一些试验表明，花开放与闭合的过程没我们想的 那么简洁.在一项争辩中，我们把花长时间放在黑暗里，并估量由于没有了 时间的参考，花不会正常开放或闭合.但事实上，花连续在正常的时间里开 放了.这项争辩表明,花通过一些未知的方式来了解时间.花不靠外物来感 知时间，所以可以说在花的内部有一个“生物钟”. 这项发觉或许不太重要.但是，人们后来发觉，不仅植物，包括人在内的动 物也有“生物钟”.生物钟把握动物的身体并影响着它们的活动.由此看来, 人同样也受到这股奇怪力气的影响.不管我们是否情愿，生物钟影响了我 们生活中的一些事，比如对睡觉，吃饭的需求. 在过去，人们居住在大自然里，生物钟没那么重要.而现今,在现代化社会 里，状况变了.对于太空人，民航飞行员和必需经常在夜间工作的人来说, 多多了解生物钟格外有用.像花的开放与闭合这类司空见愦的事情，或许 能让我们更深化的了解自己.
