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[单选题]
Usually it（)3 years to complete the study of Phd.
A.taken
B.took
C.takes
D.taking
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A.taken
B.took
C.takes
D.taking
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更多“Usually it()3 years to complet…”相关的问题
Many Americans still _____1 whether honesty was an important part of the American Character.______2 that reason,there are ______3 watch-dog committees at all levels of society.Although signs of dishonesty in school,business,and government seem much more numerous in recent years than in the past,could it be that we are getting better at revealing such dishonesty？ Some evidence is ______4 that dishonesty may ebb and flow.When times are hard,incidents of theft and cheating usually go ______ 5.And when times get better such incidents tend to go down.
experimenting on mice. They are studying the relationship between diet and health. At this time, over one hundred experiments are being done in this laboratory.
In one of these experiments, the scientists are studying the relationship between the amount of food the mice eat and their health. The mice are in three groups. All three groups are receiving the same healthy diet. But the amount of food that each group is receiving is different. The first group is eating one cup of food each day, the second group is eating two cups, and the third group of mice is eating three cups.
After three years, the healthiest group is the one that is only eating one cup of food each day. The mice in this group are thinner than normal mice. But they are more active. Most of the day, they are running, playing with one another, and using the equipment in their cages. Also, they are living longer. Mice usually live for two years. Most of the mice in this group are still alive after three years.
The second group of mice is normal weight. They are healthy, too. They are active, but not as active as the thinner mice. But they are only living about two years, not the three years or more of the thinner mice.
The last group of mice is receiving more food than the other two groups. Most of the day, these mice are eating or sleeping. They are not very active. These mice are living longer than the scientists thought - about a year and a half. But they aren't as healthy. They're sick more often than the other two groups.
(1)、The scientists in the laboratory are studying the relationship between the amount of food and diet.
A：T
B：F
(2)、The first two groups are receiving the most food.
A：T
B：F
(3)、The first group is the thinnest because they do not have a healthy diet.
A：T
B：F
(4)、Normal mice usually live for two years.
A：T
B：F
(5)、The text tells us that people who eat less and exercise more will live longer.
A：T
B：F
This important change in women' s life has only recently begun to have its full effect on women's economic position. Even a few years ago most girls left school and took a full-time job. However, when they married, they usually left work at once and never returned to it. Today the school-leaving age is sixteen, many girls stay at school after that age, and though women marry younger, more married women stay at work at least until shortly before their first child is born. Very many more afterwards return to full or part-time work. Such changes have led to a new relationship in marriage, with the husband accepting a greater share of the duties and satisfactions of family life.
We are told that in a family about 1900 ______.
A．few children died before they were five
B．seven or eight children lived to be more than five
C．the youngest child would be fifteen
D．four or five children died when they were five
LIU HUI：Hi, Mei.(1)Are you settling in well here in this city
BAI MEI：Well, thank you very much for asking. Everything is going OK.
LIU HUI:(2)Did they all join you living here BAI MEI：
Oh no. My parents have their own lives because my father has a grocery store. So he must take care of his business and my mother stays with him.
LIU HUI：Oh, I got it.(3)Are they in their school years
BAI MEI：Yes, they all attend the international schools here, but I still teach them Chinese at home.
LIU HUI:(4)What kind of food do you usually have with your family
BAI MEI：Everyone in the family loves Chinese food. But we have western food on some special occasions, you know, I have an American hubby.
LIU HUI：Right.(5)
BAI MEI：Pleasure.
A. Thank you for sharing this with me.
B. That's very interesting.
C. How is everything
D. How about your children
E. How is your family _Bai Mei： tells Liu Hui about her family_. …
Population tends to grow at an exponential(指数的)rate. This means that they progressively double. As an example of this type of growth rate take one penny and double every day for one month. After the first week, you would have only 64 cent, but after the fourth week you would have over a million dollars.
This helps explain why the population has come on“all of a sudden”took from he beginning of human 1ife to the year 1830 for the population of the earth to reach one billion. That repents(缓慢进行) a time span of at least two million years. Then it took from 1830 to 1930 for world population to reach 2 billion. The next billion was added by 1960 only thirty years and in 1975 world population reached 4 billion which is another billion people in only fifteen years.
World population is increasing at a rate of 9, 000per hour, 220, 000 per day and 80 million per year. This is not only due to higher birth rate, but to lower death rate as well. The number of births has not declined at the same rate as the number of deaths.
Some countries such as Columbia, Thailand, Morocco, Costa Rica and the Philippines are doubling their population about every twenty-one years with a growth rate of 3 percent a year or more. The United States is doubling its population about very eighty-seven years, with a rate of 0. 8 percent per year. Every time a population doubles, the country involved needs twice as much of everything, including hospitals, schools, resources, food and medicines to care for its people. It is easy to see that this is very difficult to achieve for the more rapidly growing countries.
This passage chiefly discusses______________
A.the growth of world population.
B.one type of the exponential rate.
C.the population problem of more rapidly growing countries.
D.the possible ways of dealing with the rapid population growth.
According to the passage what helps to explain why the population problem has come on “all of a sudden” ？A.The penny that doubles itself every day for one month.
B.The time span of at 1east two million years in human history.
C.An illustration of the exponent growth rate given by the author.
D.The large amount of money you would luckily make after the fourth week.
It took_________ for the world to increase its population from 1 billion to 4 billion.
A.100 years
B.175 years
C.1975 years
D.over two million years
Which of the following statements is NOT true？A.World population is increasing at a rate of 150 per minute.
B.Lower death rate also contributes to world population growth.
C.The population of Columbia has been doubling every year for 21 years.
D.The United States is usually doubling its population on about every 87 years.
When a population doubles, the country involved needs twice as much of everything including __.A.hospitals and medicines
B.schools and students
C.food and manpower resources
D.all of the above
请帮忙给出每个问题的正确答案和分析，谢谢！
In 1905, the National Audubon Society was formed by people who were also interested in birds and wanted to continue Audubon's nature studies. Even now, when people think of the Audubon Society, they usually think of birds. But the society does other things besides watching birds.
The members of the Society try to improve the environment as much as they can. They have helped pass many laws that protect birds and animals, and people, too. They taught young people how to protect their environment. They try to make their own communities cleaner, better places to live in.
John James Audubon knew that nature was important, He did not know how important his work would become.
Audubon ______.
A．was not famous 130 years ago
B．is still famous now
C．was famous 200 years ago
D．is not famous now
Americans are ready to receive us foreigners at their homes, share their holidays, and their home life. They will enjoy welcoming us and be pleased if we accept their hospitality (好客) easily.
Another difficult point for us Chinese to understand Americans is that although they include us warmly in their personal everyday lives, they don’t show their politeness to us if it requires a great deal of time. This is usually the opposite of the practice in our country where we may begenerous with our time. Sometimes, we, as hosts, will appear at airports even in the middle of the night to meet a friend. We may take days off to act as guides to our foreign friends. The Americans, however, express their welcome usually at homes, but truly can not manage the time to do a great deal with a visitor outside their daily routine. They will probably expect us to get ourselves from the airport to our own hotel by bus. And they expect that we will phone them from there. Once we arrive at their homes, the welcome will be full, warm and real. We will find ourselves treated hospitably.
For the Americans, it is often considered more friendly to invite a friend to their homes than to go to restaurants, except for purely business matters. So accept their hospitality at home!
1.The writer of this passage must be a Chinese.()
2. Americans will continue their friendships again even after a long break.()
3.From the last two paragraphs we can learn that when we arrive in America to visit an American friend, we will probably be warmly welcomed at the airport.()
4.The underlined words “generous with our time” in Paragraph 3 probably mean willing to spend time.
5.A suitable title for this passage would probably be “Americans’ and Chinese’s views of friendships”.()
Living alone has become more acceptable in American society.In the past people sometimes think those who lived alone were a little strange.These days,however,several of the most popular TV shows tell the story of men and women who can't meet "the right person" and who plan to be single forever.Many such single people (especially women) feel that they are more free to pursue (追求) their careers (事业) than those who are married.In a way these people are married to their jobs.
1.About 23 million people over the age of 21 were not married in America by 1996.
A.T
B.F
2.Most of men usually get married at the age of 27 in America.
A.T
B.F
3.In the past,people thought it was impossible to live alone.
A.T
B.F
4.Some people in America wouldn't like to get married,because they can't meet "the right person".
A.T
B.F
5.More and more people in the U.S.choose not to marry.
A.T
B.F
Indians had come from Asia thousands of years before Columbus saw them.
Thousands of years ago, the Earth was in an ice age. (76) People who lived in northeastern Asia found their homeland growing colder. Huge sheets of ice were spreading over the land and animals people hunted for food were being forced away. The people also had to move, to stay near the animals. Some groups of people crossed Bering Strait from Asia to North Pacific Ocean, which separates northeastern Asia from Alaska. (77) These people slowly traveled east and south, searching for areas where hunting was good. Their children and all those who came after them continued to spread throughout the New World.
The Indians do not have yellowish skin that many Asian people have. Their skin is reddish brown. But like the people of Japan and other countries of Asia, Indians usually have high cheekbones and straight black hair.
In 1492, Christopher Columbus ______.
A．found American Indians in Asia
B．thought he had reached India
C．landed in India
D．reached the continent of Asia
People produce food in many ways.Agriculture，or farming，developed thousands of years ago. ___11___about 100 years ago, most farmers in the United States Produced only enough food for their own___12___Today,modern equipment and farming methods have greatly ___13___the American farmer’s productivity.
In various parts of the world,people___14___many animals that supply meat and milk. Cattle, horses, goats, sheep, and pigs are important food animals. In the United States, the cow is the major source of milk products. Chickens___15___ people with both meat and eggs.
Fishing is an important source of food, ___16___in areas near the sea. Some countries, like Japan, consume much more fish than meat.
The wealthy areas of the world consume the most food , ___17___include the United States, Canada, and Europe. Many countries are able to import food if it cannot be produced at home. ___18___Great Britain imports about 75percent of its meat，and grows less than half the food its people require.
___19___people of the poor countries of the world usually eat only what they are able to produce themselves. In some parts of Asia, people live ___20___rice alone.
11.A.In B.Until C.From D.for
12.A.needs B.reasons C.efforts D.interests
13.A.protected B.supported C.increased D.reflected
14.A.grow B.raise C.train D.store
15.A.prepare B.treat C.serve D.provide
16.A.certainly B.actually C.occasionally D.especially
17.A.these B.where C.which D.they
18.A.In addition B.For example C.Above all D.After all
19.A.However B.Therefore C.Moreover D.instead
20.A.with B.for C.on D.through
