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Long Life Concrete Bridges
Each year, road accidents kill a million people and injure millions more．The economic costs are greatest for developing countries．
Earlier this year, the United Nations called for a campaign to improve road safety．
One way to avoid accidents is better driving．Another is better roads and bridges．Engineers in the United States have designed ten new concrete(混凝土) mixtures that they think could make bridges last longer．
Professor Paul Tikalsky leads the experiments by a team at Pennsylvania State University．He says bridges made of concrete now last about twenty-five to thirty-five years．But he says the new mixtures might extend that to seventy-five or even one hundred years．
Concrete is made of stone, sand, water and cement(水泥)．The materials in the cement hold the concrete together．Ancient Romans built with concrete．Yet strengthened concrete bridges did not appear until the late eighteen-hundreds．People keep looking for new ways to improve concrete．Professor Tikalsky says it is one of the most complex of all chemical systems．
The new mixtures designed by his team contain industrial waste products．He says these make the concrete better be able to resist damage from water and salt over time．One of the products is fly ash．This is released into the air as pollution when coal is burned．
Professor Tikalsky says particles(颗粒) of fly ash are almost exactly the same size and chemical structure as Portland cement．This is the most costly material in concrete． So using fly ash to replace some of it would save money．
Over the next two years, engineers will study ten bridges in Pennsylvania．These were built from the different cement mixtures designed by Professor Tikalsky’s team．He says longer-lasting bridges could save the state more than thirty-five-million dollars a year．And he says the materials would be environmentally friendly．
The federal government is paying for part of the research．Engineers anywhere can use the technology．Professor Tikalsky says some of the ideas have already been put to use in China, the Philippines and other countries．
1．What does the underlined word“This”in the seventh paragraph mean?
A．Fly ash． B．Portland cement． C．Sand． D．Chemical．
2．What is the main idea of the passage?
A．The causes of road accidents．
B．The advantages about fly ash．
C．The measures of avoiding road accidents．
D．Latest information about long-life concrete bridges．
3．What can you conclude from the passage?
A．Engineers have to pay a lot of money to use the new bridge technology．
B．Pennsylvania State University is paying all the money for the research．
C．Bridges built with fly ash are cheaper than common bridges．
D．Fly ash is much expensive than Portland cement．
4．Which of the following statements is TRUE?
A．Ten new concrete bridges have already been built in the United States．
B．A new concrete bridge could last 50 more years than an ordinary concrete one．
C．People didn’t know how to build with cement until the late 1880s．
D．Water and salt won’t do any damage to bridges over time．
查看习题详情和答案>>.
Experts believe that there are about 40,000 different types of jobs in the world. Choosing the right one is a difficult job in itself.
“Finding a job” is not the same as “choosing a job”. Many young people end up in a job that they are not suited to. “Chance” may play a more important part than “decision”. So here are a few steps to help you think about jobs, which you might enjoy doing after school or university.
First, it is important to recognize what kind of person you are and which special qualities make you different from everyone else.
To examine your skills and abilities even further, ask yourself this question: in the following three areas — skills with people, skills with information or skills with things — which are your best skills?
You may have noticed something while you were doing this task. The point is that there is a difference between an interest and a skill. If you like are and enjoy looking at pictures, it is an interest. But if you can draw a horse that looks like a horse and not a big dog, that looks like a horse and not a big dog, that looks like a horse and not a big dog, that is a skill. The best job is one that uses your skills n something that you are interested in. in addition to this, it is an advantage if you believe that a particular job is worth doing in the world.
After that, the next step is research. To find out as much as possible about different kinds of work, go to the library and read books, magazines and newspapers. Ask your friends about the work they do. If you are interested in banking, it is better to talk to a bank clerk who is twenty –four, rather than a bank manager who is sixty –four. Do not rely on your parents’ friends for information. A younger person will be able to describe a normal day at work and tell you about the interesting or boring things when you first start working.
Finally, trust your own ideas and your own thinking! It is your own life, so find something that you enjoy doing.
61. The difference between “finding a job” and “choosing a job” lies in _______.
A. finding a job is a decision while choosing a job is a chance
B. finding a job is more important than choosing a job.
C. A job that you find is one who is more suitable for you than one that you choose
D. A job that you choose is based on your decision and suits you while one that you find often isn’t.
62. What is the first step to find a job that suits you well?
A. The first step is to recognize what kind of person you are and which special qualities make you different from everyone else.
B. The first step is to find out as much as possible about different kinds of work.
C. The first step is to ask your friends about the work they do.
D. The first step is to consider your parents’ advice.
63. All the things are ways of research about different kinds of work except______.
A. Go to library and refer to books.
B. Turn to your friends to help.
C. Turn to your parents’ friends for advice.
D. Talk to a younger person for information
64. If you are interested in banking, you should talk to a bank clerk who is twenty –four instead of a bank manager who is sixty –four because_________.
A. they will be able to describe a special day at work.
B. they are full-time workers and can tell you about the interesting or boring things at work.
C. it is easier to find a bank clerk than to find a bank manager.
D. they are easier to get along with
65. Where does the passage probably appear?
A .A textbook B. A newspaper C. A TV programme D. A magazine
.
Experts believe that there are about 40,000 different types of jobs in the world. Choosing the right one is a difficult job in itself.
“Finding a job” is not the same as “choosing a job”. Many young people end up in a job that they are not suited to. “Chance” may play a more important part than “decision”. So here are a few steps to help you think about jobs, which you might enjoy doing after school or university.
First, it is important to recognize what kind of person you are and which special qualities make you different from everyone else.
To examine your skills and abilities even further, ask yourself this question: in the following three areas — skills with people, skills with information or skills with things — which are your best skills?
You may have noticed something while you were doing this task. The point is that there is a difference between an interest and a skill. If you like are and enjoy looking at pictures, it is an interest. But if you can draw a horse that looks like a horse and not a big dog, that looks like a horse and not a big dog, that looks like a horse and not a big dog, that is a skill. The best job is one that uses your skills n something that you are interested in. in addition to this, it is an advantage if you believe that a particular job is worth doing in the world.
After that, the next step is research. To find out as much as possible about different kinds of work, go to the library and read books, magazines and newspapers. Ask your friends about the work they do. If you are interested in banking, it is better to talk to a bank clerk who is twenty –four, rather than a bank manager who is sixty –four. Do not rely on your parents’ friends for information. A younger person will be able to describe a normal day at work and tell you about the interesting or boring things when you first start working.
Finally, trust your own ideas and your own thinking! It is your own life, so find something that you enjoy doing.
61. The difference between “finding a job” and “choosing a job” lies in _______.
A. finding a job is a decision while choosing a job is a chance
B. finding a job is more important than choosing a job.
C. A job that you find is one who is more suitable for you than one that you choose
D. A job that you choose is based on your decision and suits you while one that you find often isn’t.
62. What is the first step to find a job that suits you well?
A. The first step is to recognize what kind of person you are and which special qualities make you different from everyone else.
B. The first step is to find out as much as possible about different kinds of work.
C. The first step is to ask your friends about the work they do.
D. The first step is to consider your parents’ advice.
63. All the things are ways of research about different kinds of work except______.
A. Go to library and refer to books.
B. Turn to your friends to help.
C. Turn to your parents’ friends for advice.
D. Talk to a younger person for information
64. If you are interested in banking, you should talk to a bank clerk who is twenty –four instead of a bank manager who is sixty –four because_________.
A. they will be able to describe a special day at work.
B. they are full-time workers and can tell you about the interesting or boring things at work.
C. it is easier to find a bank clerk than to find a bank manager.
D. they are easier to get along with
65. Where does the passage probably appear?
A .A textbook B. A newspaper C. A TV programme D. A magazine
查看习题详情和答案>>
.
Experts believe that there are about 40,000 different types of jobs in the world. Choosing the right one is a difficult job in itself.
“Finding a job” is not the same as “choosing a job”. Many young people end up in a job that they are not suited to. “Chance” may play a more important part than “decision”. So here are a few steps to help you think about jobs, which you might enjoy doing after school or university.
First, it is important to recognize what kind of person you are and which special qualities make you different from everyone else.
To examine your skills and abilities even further, ask yourself this question: in the following three areas — skills with people, skills with information or skills with things — which are your best skills?
You may have noticed something while you were doing this task. The point is that there is a difference between an interest and a skill. If you like are and enjoy looking at pictures, it is an interest. But if you can draw a horse that looks like a horse and not a big dog, that looks like a horse and not a big dog, that looks like a horse and not a big dog, that is a skill. The best job is one that uses your skills n something that you are interested in. in addition to this, it is an advantage if you believe that a particular job is worth doing in the world.
After that, the next step is research. To find out as much as possible about different kinds of work, go to the library and read books, magazines and newspapers. Ask your friends about the work they do. If you are interested in banking, it is better to talk to a bank clerk who is twenty –four, rather than a bank manager who is sixty –four. Do not rely on your parents’ friends for information. A younger person will be able to describe a normal day at work and tell you about the interesting or boring things when you first start working.
Finally, trust your own ideas and your own thinking! It is your own life, so find something that you enjoy doing.
61. The difference between “finding a job” and “choosing a job” lies in _______.
A. finding a job is a decision while choosing a job is a chance
B. finding a job is more important than choosing a job.
C. A job that you find is one who is more suitable for you than one that you choose
D. A job that you choose is based on your decision and suits you while one that you find often isn’t.
62. What is the first step to find a job that suits you well?
A. The first step is to recognize what kind of person you are and which special qualities make you different from everyone else.
B. The first step is to find out as much as possible about different kinds of work.
C. The first step is to ask your friends about the work they do.
D. The first step is to consider your parents’ advice.
63. All the things are ways of research about different kinds of work except______.
A. Go to library and refer to books.
B. Turn to your friends to help.
C. Turn to your parents’ friends for advice.
D. Talk to a younger person for information
64. If you are interested in banking, you should talk to a bank clerk who is twenty –four instead of a bank manager who is sixty –four because_________.
A. they will be able to describe a special day at work.
B. they are full-time workers and can tell you about the interesting or boring things at work.
C. it is easier to find a bank clerk than to find a bank manager.
D. they are easier to get along with
65. Where does the passage probably appear?
A .A textbook B. A newspaper C. A TV programme D. A magazine
查看习题详情和答案>>