题目内容
There are many superstitions in Britain，but one of the most (1) held is that it is unlucky to walk under a ladder—even if it means． (2) the pavement into a busy street! (3) you must pass under a ladder you can (4) bad luck by crossing your fingers and (5) them crossed until you have seen a dog． (6) ，you may lick your finger and (7) a cross on the toe of your shoe，and not look again at the shoe until the (8) has dried． Another common (9) is that it is unlucky to open an umbrella in the house—it will either bring (10) to the person who opened it or to the whole (11) ．Anyone opening an umbrella in fme weather is (12) ，as it inevitably brings rain! The number 13 is said to be unlucky for some，and when the 13th day of the month (13) on a Friday，anyone wishing to avoid a bad event had better stay (14) ．The worst misfortune that can happen to a person is caused by breaking a mirror， (15) it brings seven years of bad luck! The superstition is supposed to (16) in ancient times，when mirrors were considered to be tools of the gods． Black cats are generally considered lucky in Britain，even though they are (17) witchcraft．It is (18) lucky if a black cat crosses your path—although in America the exact opposite belief prevails． Finally，a commonly held superstition is that of touching wood (19) luck．This measure is most often taken if you think you have said something that is tempting fate，such as“my car has never (20) ，touch wood”
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The normal human daily cycle of activity is of some 7-8 hours’sleep alternation with some 16-17 hours’wakefulness and that the sleep normally coincides (1) the hours of darkness．Our present concern is with how easily and to what extent this (2) can be modified． The question is no mere academic one．The ease with which people can change from working in the day to working at night is a (3) of growing importance in industry where automation (4) round-the-clock working of machines．It normally (5) from five days to one week for a person to adapt to a (6) routine of sleep and wakefulness，sleeping during the day and working at night． (7) ，it is often the case in industry that shifts are changed every week．This means that no sooner has he got used to one routine (8) he has to change to another， (9) much of his time is spent neither working nor sleeping very (10) ． One answer would seem to be (11) periods on each shift，a month，or even three months． (12) ，recent research has shown that people on such systems will revert to go back to their (13) habits of sleep and wakefulness during the weekend and that this is quite enough to destroy any (14) to night work built up during the week．The only real solution appears to be to hand over the night shift to those permanent night workers whose (15) may persist through all weekends and holidays．
How men first learned to invent words is unknown; (1) , the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain (2) to express thoughts and feelings, actions and things, (3) they could communicate with each other; and that later they agreed (4) certain signs, called letters, which could be (5) to represent those sounds, and which could be (6) .Those sounds, whether spoken, (7) written in letters, we call words. The power of words, then, lies in their (8) —the things they bring up before our minds. Words become (9) with meaning for us by experience; (10) the longer we live, the more certain words (11) to us the happy and sad events of our past: and the more we (12) , the more the number of words that mean something to us (13) . Great writers are those who not only have great thoughts but also express these thoughts in words which appeal (14) to our minds and emotions. This (15) and telling use of words is what we call (16) style. Above all, the real poet is a master of (17) . He can convey his meaning in words which sing like music, and which (18) their position and association can (19) men to tears. We should, therefore, learn to choose our words carefully and use them accurately, or they will (20) our speech or writing silly and vulgar.
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The normal human daily cycle of activity is of some 7-8 hours’sleep alternation with some 16-17 hours’wakefulness and that the sleep normally coincides (1) the hours of darkness．Our present concern is with how easily and to what extent this (2) can be modified． The question is no mere academic one．The ease with which people can change from working in the day to working at night is a (3) of growing importance in industry where automation (4) round-the-clock working of machines．It normally (5) from five days to one week for a person to adapt to a (6) routine of sleep and wakefulness，sleeping during the day and working at night． (7) ，it is often the case in industry that shifts are changed every week．This means that no sooner has he got used to one routine (8) he has to change to another， (9) much of his time is spent neither working nor sleeping very (10) ． One answer would seem to be (11) periods on each shift，a month，or even three months． (12) ，recent research has shown that people on such systems will revert to go back to their (13) habits of sleep and wakefulness during the weekend and that this is quite enough to destroy any (14) to night work built up during the week．The only real solution appears to be to hand over the night shift to those permanent night workers whose (15) may persist through all weekends and holidays．
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