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A.a single type of multipotent stem cell found in the bone marrow
B.differentiated cells that first developed in the fetal liver, but now reside in the bone marrow
C.division of differentiated cell types while circulating in the blood
D.stem cells that became committed to each specific blood celll type during embryonic development
答案
更多“The many different cell types in the blood of an adult mammal are derived from().”相关的问题
第2题
A.In combination, personal observation and written reports are considered superior to other methods
B.Statistical reports are the single most effective method
C.Managers should use as many as three different methods when possible
D.Managers should use all four methods, if possible
E.It is not advised to utilize oral reports and personal observation as dual methods
第3题
A、delicious
B、different
C、domestic
D、delighted
第4题
第5题
A.formal words
B.common words
C.colloquial words
D.slangs
第6题
Did you know that London is one of the most multicultural cities in the world？ Here, there are about 300 different cultures living side by side. Forget tea and sandwiches, now it is more common for a Londoner to drink cappuccino for breakfast, and eat Thai food for lunch in the local pub. Let’s see how life has changed in Britain’s capital.
A India
Most people from India arrived in London in the 1950s and 60s. Now there is a strong Asian presence here – in the shops, markets and, of course, the restaurants. In fact, curry is Britain’s favorite takeaway meal. A typical family has a curry every two weeks, either delivered or bought ready-made from the supermarket. Indian people live all over London. Southall, in the far west of the city, is one of many places well known for its Indian culture.
B Poland
This community represents more than 1% of the UK’s total population and is growing rapidly. In London, many Polish people live in the Hammersmith area, in the west of the city. Here, there are several Catholic churches, and delicatessens which sell the country’s specialities such as beetroot soup (barszcz) or Polish cakes and snacks. Were they right to come？ Young Poles say they can easily earn three times as much money here as at home, where unemployment remains high.
C West Africa
West Africans – mainly from Ghana and Nigeria – have brought a wealth of languages, music and culture to the British capital. Many London markets sell their traditional foods like yams and different types of rice. A lot of Nigerians live in the south-east London area, in suburbs like Deptford.
1、When did most people from India arrive in London？
A、The 1950s and 60s.
B、The 1950s.
C、The 1960s.
2、How often does a typical family have a curry？
A、Two times.
B、Every two weeks.
C、Two weeks.
3、Where do many Polish people live？
A、The east of the city.
B、Catholic churches.
C、The Hammersmith area.
4、Why do Polish people come to London？
A、They can earn three times as much money in the UK.
B、Unemployment remains high in the UK.
C、They are growing rapidly.
5、What kind of traditional West Africa foods do markets sell？
A、Ghana and Nigeria.
B、Languages，music and culture.
C、Yams and different types of rice.
第7题
Questions （1）to（5） are based on the following passage:
What makes a person a scientist？ Does he have ways ---or tools ---of learning that are different from those of others？ The answer is no. It is not the tools a scientist uses but how he uses these tools that makes him a scientist. You will probably agree that knowing how to use a power saw is important to a carpenter. You will probably agree, too, that knowing how to investigate, how to discover information, is important to everyone. The scientist, however, goes one step further: he must be sure that he has a reasonable answer to his question and that his answer can be confirmed by other persons. He also works to fit the answers he gets to many questions into a large set of ideas about how the world works
The scientist’s knowledge must be exact. There is no room for half right or right just half the time. He must be as nearly right as the condition permit. What works under one set of conditions at one time mustwork under the same conditions at other times. If the conditions are different, any changes the scientist observes in a demonstration must be explained by the changes in the conditions. This is one reason that investigations are important in science. Albert Einstein, who developed the theory of relativity, arrived at this theory through mathematics. The accuracy of his mathematics was latter tested through investigation. Einstein’s ideas were shown to be correct. A scientist uses many tools for measurement. Then the measurements are used to make mathematical calculations that may test his investigations.
（1）A sound scientific theory should be one that .
A) works under one set of conditions at one time and also works under the same conditions at other times
B) leaves no room for improvement
C) does not allow any change even under different conditions
D) can be used for many purposes
（2）What, according to the passage, makes a scientist？
A) The tools he uses.
B) His ways of learning.
C) The way he uses his tools.
D) The various tools he uses.
（3） Albert Einstein built up his theory of relativity through .
A) investigation
B) experiments
C) tests
D) mathematics
（4）“…Knowing how to investigate, how to discover information, is important to everyone.” The author says this to show .
A) the importance of information
B) the importance of thinking
C) the difference between scientists and ordinary people
D) the difference between carpenters and ordinary people
（5） What is the main idea of the passage？
A) Scientists are different from ordinary people.
B) The theory of relativity.
C) Exactness is the core of science.
D) Exactness and way of using tools are the key to the making of a scientist.
第8题
es of people in the world but if you go to a college campus, you are sure to find at least one of every kind. The great part about being here with so many different people is that you get to interact with some interesting characters and see how to deal with them. You will meet the people you dread the most, the smart-ass, the brain, or the unique spirit, but no matter who it is that is your worst nightmare to be around you will always be paired up with them in a group project. When you get into the real world you are not going to be able to pick your boss or coworkers. Interacting with these people in college and living with different roommates will help you learn how to cooperate with the people in life you find so unpleasant. College life is fun. The fact that I have been here for a short time just means it has not yet been a life changing experience to me. If I were to give any tips on how to survive, it would not be how to survive college, but how to survive life. I would have to say that one should be outgoing and live life to the fullest. Meet new people whenever you can because they just may be a major influence in your life. Also, get your work done before you go out and party. Lastly, I would have to say, in life if you ever feel lost or alone, talk to someone about it. Everyone gets depressed at times in their life and there is always someone who will listen to your problems.
(1)What is the theme of the passage()？
A.Relationships in college
B.Homework in college
C.Freedom in college
D.Partying in college
(2)Why does the author recommend meeting many new people()？
A.They may become your best friends
B.They may influence your life
C.They may help you someday
D.They make your life more fun
(3)How would you describe the author’s personality()？
A.Shy and under confident
B.Strong but quiet
C.Extremely pessimistic
D.Optimistic and outgoing
(4)What does the author say about group projects()？
A.They are always unpleasant
B.They are always difficult
C.Partners may not cooperate
D.Partners may be lazy
(5)What does the author say to do if you’re depressed()？
A.Go somewhere by yourself
B.Talk to someone about it
C.Try to forget about it
D.See a psychologist immediately
第9题
Scientists have found that the cause of this strange weather is that the air circulation pattern has changed and is now more variable than earlier in the twentieth century. This means that different regions of the world get long spells (持续时间) of the same type of weather, whether hot , cold, wet or windy.
However, weather experts have different views about why this has happened. One theory is that the temperature of the sea has increased. Another is that man’s activities on earth have disturbed the balance of nature.
Whatever the cause, the economics of many countries in the world depend upon the weather. And until we know exactly what effect man’s activities are having on the weather, we cannot make changes which might help. So for the moment the only answer is …wait and see!
26. Which of the following statements is TRUE according to the first paragraph？
A. We have never predicted the weather.
B. Man is now able to control the weather.
C. Strange weather has appeared only in some North American countries.
D. It has always been impossible for man to predict the weather accurately.
27. The strange weather patterns on the earth can he best described as ________.
A. steady and balanced C. likely to cause serious disasters
B. changeable but predictable D. unpredictable but favorable to man
28. The word “affecting” in Paragraph 1 can be replaced by ________.
A. yielding good crops in C. causing few losses in
B. having harmful effects on D. producing desired effects on
29. We can learn from Paragraph 2 that ________.
A. weather patterns are similar in different regions of the world
B. the air circulation pattern remains unchanged in the last century
C. our weather depends on the changes in the air circulation pattern
D. it is possible to predict weather patterns over a long period of time
30. It can be learned from this passage that ________.
A. scientists have similar opinions about the changing weather
B. no one is sure about the cause of the changing weather
C. cutting down forests has affected the climate
D. the weather will become worse in the future
第10题
In many other countries, the baby sleeps in the same bed with his parents or in a bed near them.
The space in the home also shows a lot about psychological space needs.Some families gather closer to each other and the size of their house has nothing to do with it.Others have separate little corners where family members go to be alone.
Although it is true that psychological space needs are not decided by economic reasons, they sometimes have to be changed a little because of economic pressures.It is almost impossible, however, to completely change your psychological space needs.
26.The passage is chiefly concerned with _______.
A.American way of living
B.living conditions in different countries
C.space requirements in different cultures
D.space requirements and economic factors
27.According to the author, the amount of living space a person needs is decided by ______.
A.his cultural background
B.the relationship between the family members
C.his financial situations
D.how many rooms there are in his house
28.The example of American families seems to suggest that ______.
A.Americans are more eager to be alone when they are at home
B.psychological space needs are developed when one is very young
C.it is advisable to let the baby sleep with his parents
D.it is advisable to let the baby sleep in a separate room
29.Some families gather close to each other at home because _______.
A.they have limited living space
B.it satisfies their psychological space needs
C.they have been brought up in a small family
D.they haven’t small corners for themselves
30.According to the author, psychological space needs _______.
A.will change as one’s incomes reduced
B.can be changed at will
C.will change if you move to a smaller house
D.can hardly be changed altogether
