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．
Salt，shells or metals are still used as money in out-of-the-way parts of the world today． Salt may seem rather a strange (1) to use as money． (2) in countries where the food of the people is mainly vegetable，it is often an (3) necessity．Cakes of salt，stamped to show their (4) ，were used as money in some countties until recent (5) ，and cakes of salt (6) buy goods in Borneo and parts of Africa． Sea shells (7) as money at some time (8) another over the greater part of the Old World。These were (9) mainly from the beaches of the Maldives Islands in the Indian Ocean，and were traded to India and China．In Africa，shells were traded right across the (10) from East to West． Metal，valued by weight， (11) coins in many parts of the world．Iron，in lumps，bars or rings，is still used in many countries (12) paper money．It can either be exchanged (13) goods，or made into tools，weapons，or ornaments．The early money of China，apart from shells，was of bronze， (14) in flat，round pieces with a hole in the middle．called“cash”．The (15) of these are between three thousand and four thousand years old—older than the earliest coins of the eastern Mediterranean． Nowadays，coins and notes have (16) nearly all the more picturesque (17) of money，and (18) in one or two of the more remote countries people still keep it for future use on ceremonial (19) such as weddings and funerals，examples of (20) money will soon be found only in museums．
Scientists around the world are racing to learn how to rapidly diagnose，treat and stop the spread of a new，deadly disease．SARS—Severe Acute Respiratory Syndrome—was (1) for the first time in February 2003 in Hanoi， (2) since then has infected more than 1，600 people in 15 countries，killing 63．At this (3) ，there are more questions than answers surrounding the disease． Symptoms start (4) a fever over 100．4 degrees F，chills，headache or body (5) ．Within a week，the patient has a dry cough，which might (6) to shortness of breath．In 10% to 20% of cases，patients require (7) ventilation to breathe．About 3.5% die from the disease．Symptoms (8) begin in two to seven days，but some reports suggest it (9) take as long as 10 days．Scientists are close to (10) a lab test to diagnose SARS．In the meantime，it is diagnosed by its symptoms．There is no evidence (11) antibiotics or antiviral medicines help， (12) 至doctors can offer only supportive care．Patients with SARS arekept in isolation to reduce the risk of (13) ．Scientists aren’t sure yet，but some researchers think it’s a (14) discovered coronavirus，the family of viruses that cause some common colds． Most cases appear to have been passed (15) droplets expelled when infected patients cough or sneeze．Family members of infected people and medical workers who care (16) them have been most likely to (17) the illness．But recent developments in Hong Kong suggest that the (18) might spread through air，or that the virus might (19) for two to three hours on doorknobs or other (20) ．Health experts say it is unlikely，though，that sharing an elevator briefly with an infected person would be enough to pass the virus．
Unlil I took Dr．Offutt’s class in DeMatha High school，I was an underachieving student，but I left that class (1) never to underachieve again．He not only taught me to think，he convinced me． (2) by example as words that it was my moral (3) to do so and to serve others． (4) of US could know how our relationship would (5) over the years．Wmen I came back to DeMatha to teach English，I worked for Dr．Offutt，the department chair．My discussions with him were like graduate seminars in adolescent (6) ．classroom management and school leadership． After several years, I was (7) department chair, and our relationship (8) again. I thought that it might be (9) chairing the department, since all of my (10) English teachers were (11) there, but Dr. Offutt supported me (12) . He knew when to give me advice (13) curriculum, texts and personnel, and when to let me (14) my own course. In 1997, I needed his (15) about leaving DeMatha to become principal at another school. (16) he had asked me to stay at DeMatha, I might have. (17) , he encouraged me to seize the opportunity. Five years ago, I became the principal of DeMatha. (18) , Dr. Offutt was there for me, letting me know that I could (19) him. I’ve learned from him that great teachers have an inexhaustible (20) of lessons to teach.
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