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[主观题]

Everyone uses the expressions AM and PM. But do you exactly know what they mean and how th

ey came into being？

As you know, the turning of the earth makes the sun and the stars seem to move across the sky. Daylight, of course,【21】, when the sun rises in the east and when the sun is high【22】the sky, between these two positions, half of the daylight hours have been spent.

Therefore, by noticing【23】the sun stood in the sky, early man know they could tell the time of the day, At night the motion of the stars【24】the same purpose. The important thing in keeping time is to know the exact moment of【25】. For each of us, wherever we are, noon is when the sun is directly overhead. Think of an imaginary line【26】the sky, stretching from the north point of your horizon just to the south point.

When the sun cross your meridian (子午线), it is noon for you. When the sun still【27】of this line, or the meridian, it is morning. After the sun has crossed this line, it is【28】.

The Latin word for "midday" is "deridian",【29】which comes our word meridian. So AM is an abbreviation (缩写词) for "ante meridean", or before midday, and PM for after midday. Each or the world's time zones (时区) is about fifteen degrees wide in longitude (经度), which is about the distance the sun moves through tile sky in all hour.【30】lives in the same time zone observes noon at the same moment. In this way, the time is different by one hour as you move through each time zone.

(61)

A．comes

B．begins

C．appears

D．shines

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发布时间：2021-10-27

更多“Everyone uses the expressions AM and PM. But do you exactly know what they mean and how th”相关的问题

第1题

The computer is a wonderful machine. It is the most important invention since the type of

engine used in cars. Today it has the greatest effect on science, industry and business, but it is being used more in education and medicine. By the end of this century it will touch the lives of everyone, even people in distant villages. It is a revolutionary invention.

The oldest kind of computer is the abacus, used in China since the sixth century. In the seventeenth century an adding machine was invented, but the first large, modern computer was built in 1973. A few years later a computer could do 5,000 additions per second. Now the computations are so fast that they are measured in nanoseconds.

Today most computers are stored-program computers, that is, they have a memory. They are getting smaller and smaller, and computing faster and faster. Even in a large computer, the part that does the actual computing is about the size of the end of a finger.

Computers can do all kinds of work. When someone buys something in a department store, in formation about the sale goes into a computer. A scientist can talk to the computer about the rocks, and the computer answers the questions. A doctor can talk to the computer and explains what is wrong with a patient. If the doctor asks why, the computer goes through its stored information and ex plains exactly why.

When early humans began fanning, it was a revolutionary change in human life. It was hundreds of thousands of years later that people developed a writing system. In less than fifty years people have developed computers that can do most of the things humans can do. This could be a frightening development.

The oldest kind of computer, the abacus, has been used since ______.

A．600

B．700

C．800

D．500

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第2题

填空：Everyone ？ of the President of the US ？ the most powerful man in ？

Directions: There are 20 blanks in the following passage. For each blank there are four choices marked A), B), C) and D). You should choose the ONE that best fits into the passage.

Everyone ___71___ of the President of the US ___72___ the most powerful man in ___73___. But when the representatives of the 13 former British colonies ___74___ to draw up the constitution of the new country ___75___ 1788, ___76___ of them were not sure whether they ___77___ to have a President at all. There were even ___78___ who ___79___ a king, ___80___ their successful war against the British king, George III. The decision was in doubt ___81___ the last moment. One group wanted ___82___ for life, while ___83___ suggested that ___84___ not be a President, because a Committee would govern the country better; a third group ___85___ a President ___86___ term of office would last seven years but who could not stand for reelection, because they were afraid he would spend his time ___87___ votes at the next election. In the end they chose George Washington as President for four years and let him ___88___ for reelection because they trusted him. But they were ___89___ to make rules in case a future President ___90___ badly and these rules were used to get rid of President Nixon two hundreds years later.

71. A) use to think B) think C) thinks D) uses to think

72. A) to be B) being C) like D) as

73. A) western world B) the western world C) accident D) the accident

74. A) found B) met C) encountered D) put together

75. A) at B) by C) on D) in

76. A) a number B) a great deal C) a large amount D) the most

77. A) should B) would C) needed D) must

78. A) few B) a few C) little D) a little

79. A) had preferred B) would have preferred

C) should have preferred D) were preferring

80. A) although B) however C) nevertheless D) in spite of

81. A) until B) as far as C) so far as D) by

82. A) that the President was elected

B) that the President would be elected

C) to elect the President

D) to be elected the President

83. A) another B) other C) the other D) some other

84. A) it should B) it would C) there should D) there would

85. A) would have liked B) would rather C) would like D) would be liking

86. A) that's B) whose C) which D) of which

87. A) looking for B) to look for C) to look at D) looking at

88. A) stand B) to stand C) be standing D) that he stood

89. A) so careful B) too careful C) careful enough D) enough careful

90. A) would carry B) carried C) would behave D) behaved

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第3题

Passage OneQuestions 21 to 25 are based on the following passage. Your passport is your of

Passage One

Questions 21 to 25 are based on the following passage.

Your passport is your official identification as an American citizen. In America，most people never consider obtaining a passport unless they are planning a trip out of the country. In Europe, where travel from one country to another is much more common，almost everyone carries a passport. A passport is final proof of identity in almost every country in the world.

In 1979 almost 15 million Americans held passports. Most of these passports were obtained to travel outside the country because，except for a few Western nations。passports are required to enter every country. And if you travel abroad，you must have a valid passport to reenter the country.

When traveling abroad，you will need a passport for identification when exchanging dollars for francs or marks or other foreign currency. You may also need your passport to use a credit card，buy an airplane ticket or check into a hotel. As a passport is an official U. S. document. it is valuable as identification in any emergency cases，such as floods，fires，or war.

Don't confuse passports and visas. Whereas a passport is issued by a country to its citizens. a visa is official permission to visit a country granted by the government of that country. For some years，many countries were dropping their visa requirements，but that trend has reversed. Argentina，Brazil，and Venezuela now require visas from U. S. citizens. They may be obtained from the embassy of the country you wish to visit.

Passport applications are available at passport agency offices in large cities like Boston，New York，or Chicago. In smaller cities，applications are available at post offices and at federal courts. To get your first passport，you must submit the application in person. along with a birth certificate and two pictures.

The main purpose of this passage is to______.

A. discuss traveling in other countries

B. distinguish between passports and visas

C. discuss the financial uses of a passport

D. provide information about passports

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第4题

One argument used to support the idea that employment will continue to be the dominant for

m. of work, and that employment will eventually become available for all who want it, is that working time will continue to fall. People in jobs will work fewer hours in the day, fewer days in the week, fewer weeks in the year, and fewer years in a lifetime, than they do now. This will mean that more jobs will be available for more people. This, it is said, is the way we should set about restoring full employment.

There is no doubt that something of this kind will happen. The shorter working week, longer holidays, earlier retirement, job-sharing -- these and other ways of reducing the amount of time people spend on their jobs -- are certainly likely to spread. A mix of part-time paid work and part-time unpaid work is likely to become a much more common work pattern than today, and a flexi-life pattern of work -- involving paid employment at certain stages of life, but not at others -- will become widespread. But it is surely unrealistic to assume that this will make it possible to restore full employment as the dominant form. of work.

In the first place, so long as employment remains the overwhelmingly important form. of work and source of income for most people that it is today, it is very difficult to see how reductions in employees' working time can take place on a scale sufficiently large and at a pace sufficiently fast to make it possible to share out the available paid employment to everyone who wants it. Such negotiations as there have recently been, for example in Britain and Germany, about the possibility of introducing a 35-hour working week, have highlighted some of the difficulties. But, secondly, if changes of this kind were to take place at a pace and on a scale sufficient to make it possible to share employment among all who wanted it, the resulting situation --in which most people would not be working in their jobs for more than two or three short days a week -- could hardly continue to be one in which employment was still regarded as the only truly valid form. of work. There would be so many people spending so much of their time on other activities, including other forms of useful work, that the primacy of employment would be bound to be called into question, at least to some extent.

The author uses the negotiations in Britain and Germany as an example to

A．support reductions in employees' working time.

B．indicate employees are unwilling to share jobs.

C．prove the possibility of sharing paid employment.

D．show that employment will lose its dominance.

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第5题

下列各项中哪些有可能是支持关税或出口补贴的有效论据，哪些不足，为什么？ a．“美国的石油进口量越大，那么在

下列各项中哪些有可能是支持关税或出口补贴的有效论据，哪些不足，为什么？

a．“美国的石油进口量越大，那么在下一次世界性的石油短缺中石油价格就越高。”

b．“美国非时令水果如冬葡萄等供应的80%都来自智利。随着智利非时令水果出口量的不断增加，这些昔日的奢侈品的价格已大幅下降。”

c．“美国农产品出口不仅对农民意味着更高的收入，而且对任何一个把产品及服务出售给美国农业部门的人来说都意味着更高的收入。”

d．“半导体就好比是技术的‘原油’；如果我们自己不生产芯片，那么对每一个使用微电子技术的产业来说，关键的信息流动就会被破坏”。

e．“木材的实际价格下降了40%，以致成千上万的木材工人被迫去寻找其他工作”。

Which of the following are potentially valid arguments for tariffs or export subsidies，and which are not(explain your answers)？

a．“The more oil the United States imports，the higher the price of oil will go in the next world shortage．”

b．“The growing exports of off-season fruit from Chile．which now accounts for 80 percent of the U.S. supply of such produce as winter grapes，are contributing to sharply falling prices of these former luxury goods．”

c．“U.S. farm exports don't just mean higher incomes for farmers--they mean higher income for everyone who sells goods and services to the U.S. farm sector．”

d．“Semiconductors are the crude oil to technology；if we don't produce our own chips，the flow of information that is crucial to every industry that uses microelectronics will be impaired”

e．“The real price of timber has fallen 40 percent，and thousands of timber workers have been forced to look for other jobs．”

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第6题

若f（u）可导，且y=f（ex），则dy=（）

A.'（ex）dx

B.'（ex）exdx

C.（ex）exdx

D.'（ex）

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第7题

已知y=xe^x，n为自然数，则y^（n)=（)

A.x

B.e^x

C.(x+n)e^x

D.(x+n)e^x

E.xe^x

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第8题

简述ex vivo和in vivo两种基因治疗途径。

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第9题

设y=ex·sinx，试求y（n)

设y=e^x·sinx，试求y⁽ⁿ⁾

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第10题

电器设备上“EX”、“KY”分别是指什么？

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