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There have been many（）in their marriage but they still love each other.
A . right and wrong
B . back and forth
C . ups and downs
D . right and left
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The options on the NFS server using the nfso command have been adjusted. Which of the following tasks are required in order for these changes to survive a system reboot？（）
A . update /etc/rc.nfs
B . issue the chnfs command
C . recycle nfsd
D . unmount and remount the file system
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There have been（）medicine in the last 50 years.
A . great advancesin
B . a great advancein
C . great advanceon
D . a great advanceo
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A machine has just been installed with AIX, and no system parameters have been changed. In order to enable routing function, which of the following "no" options should be changed?（）
A . set bcastping to 1
B . set ipforwarding to 1
C . set rfc1323 to 1
D . set directed_broadcast to 1
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There have been no reports ____ of rosiglitazone–associated elevations in the aminotransferase level or hepatotoxicity.
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There have been about 400 cancer deaths among 100,000 Japanese nuclear bomb survivors.属于common knowledge.
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They have been there twice, _______________ ?
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Though many things have been changed culturally, there is a commitment and sense of responsibility that have not been _____ in today’s society.
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______ said, “There are three inventions which have decisively changed the world.”
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Find out the incorrect parts and put the corresponding letter after the statement.In the past 3 years, great changes have been taken place in my hometown. For example, loads of buildings have been torn away and rebuilt.
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They have been there twice, _______________ ?
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There has been a sharp ______ in profits this year, so some companies have dismissed many employees.
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There have been complaints about the noise from the people ___________ live in the flats.
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We have been told that under no circumstances ________ the telephone in the office on the first day when I was offered a job there.
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These concerns have been further sti______ by the change in public attitudes to safety and environmental issues, many of which are closely linked to energy.
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The disease is w______ in America and quite recently there have been reports of cases in dogs in the UK.
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At the 1986 Chernobyl nuclear accident, there was a very large release of radioactivity in a few minutes, followed by a slowly declining release rate over several months. The total release is estimated to have been about 5×10<sup>7</sup>curies The winds carried the released materials all the way to Sweden, from which the first reports came that there had been a nuclear accident in the USSR.
For the purposes of this problem assume that there was an instantaneous release of 10<sup>7</sup>curies of radioactive gases (and fine particles, which are assumed to remain in the atmosphere and not settle out). Then estimate the maximum ground level concentration of radioactive gases (curies/m<sup>3</sup>) when the radioactive cloud from the accident got to Sweden. Make the following assumptions:
(1) Ignore decay of the radioactive gases (i.e., assume their half-lives were infinite).
(2) Assume the distance between Chernobyl and Sweden is 1000 km.
(3) Assume that the wind speed was 3 m/s and the stability class C.
(4) Assume that the mixing height was 2000 m.
(5) Assume that mlXmg in the x direction(up and down the direction of the wind) has the same intensity as miXing in the y(crosswind)direction.
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Increasingly, over the past ten years, people—especially young people—have become aware of the need to change their eating habits, because much of the food they eat, particularly foods, is not good for the health. Consequently, there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers, widely used in farming to- day.
Natural foods, for example, vegetables, fruits and grains which have been grown in soil that is rich in organic matter. In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount—but not the quality—of foods grown in commercial farming areas.
Natural foods also include animals which have been allowed to feed and move freely in healthy pastures. Compare this with what happens in the mass production of poultry: there are battery farms, for ex- ample, where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish. Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins.
There are other aspects of healthy eating which are now receiving increasing attention from experts on diet. Take, for example, the question of sugar, this is actually a non-essential food! Although a natural alternative, such as honey, can be used to sweeten food if this is necessary, we can in fact do without it. It is not that sugar is harmful in itself. But it does seem to be an additive: the quantity we use has grown steadily over the last two centuries and in Britain today each person consumes an average of 200 pounds a year! Yet all it does is provide us with energy, in the form. of calories. There are no vitamins in it, no minerals and no fibre.
It is significant that nowadays fibre is considered to be an important part of a healthy diet. In white bread, for example, the fibre has been removed. But it is present in unrefined flour and of course in vegetable. It is interesting to note that in countries where the national diet contains large quantities of unrefined flour and vegetable, certain diseases are comparatively rare. Hence the emphasis placed on the eating of wholemeal bread and more vegetables by modern experts on healthy eating.
Recently, some people are interested in natural foods because ______.
A．these foods are fresh and sweet
B．they want to change their eating habits
C．these foods do not contain chemical additives and have not been affected by chemical fertilizers
D．they don't like the processed foods
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The industrial societies have been extremely productive during the last two centuries. The economic advance has been remarkable. During this relatively short period of time, greater changes in people's living conditions have occurred than in the thousands of years which preceded.
During the past 200 years the world population has increased 6 times, the annual world output has increased 80 times, and the distance a person can travel has gone up 1,000 times. There has also been much recent progress in art, culture, learning, and science. Such changes have led to a high rate of production and growth of the economy.
Economists fear that within the next 100 to 150 years, the earth's resources will become very scarce. Their fears are partly justified, but we should not be afraid. Industrial civilization adapts to new knowledge. By advancing knowledge, we not only create new forms of resources, but we also find ways to economize their use. Advanced modern knowledge can feed the hungry people of the world and improve their standard of living.
The figures in the second paragraph are used for the following purposes EXCEPT______.
A．prediction.
B．contrast.
C．definition.
D．explanation.
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"During last decade, there have been many changes in family life.""Are these changes ________ ？"
A．for the good or for the bad
B．for the worse or for the better
C．for worse or for better
D．for the worst or for the best
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So far there have not been definite data to confirm_________.
A．where fewer people die from heart problem．
B．whether thev have the risk of heart attack，heart failure or stroke．
C．would probably have lower rates 0f heart disease．
D．how to test a person’s NT—pmBNP level in the blood by himself．
E．his heart muscle would be under pressure in some way．
D．that napping is 0f great benefit to women too.
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I have certainly seen lots of changes in my lifetime! I look around my home and see "mod cons" that I could never have dreamed of 50 or 60 years ago. I spent the early part of childhood in a cottage without running water or electricity and yet these days, I feel paralyzed if there is a power cut for even just an hour or two! So, I have changed too. Things that I couldn't even imagine in the past now seem quite normal.
Businessmen can travel from London to New York in three hours and lots of people exceed the seventy-mile-per-hour speed limit on motorways. A person of 75 is not old these days. A serious illness does not mean certain death because there have been so many advances in medical science. We no longer need to be afraid of contracting diseases like polio or smallpox. I can speak to my son in Australia from my own sitting room here in Manchester, watch athletes running a race on the other side of the world without moving from my own home and I can even do my shopping while I sit here in an armchair. I never need to worry about food going bad in the warm weather and, at the flick of a switch, I can have a hot meal in a couple of minutes. So, it seems, the quality of life has greatly improved since my own childhood.
I'm not convinced, however, that people are happier today than they were 50 years ago. We are certainly materially better off than we were but most people still seem to be weighed down by problems. My daughter and her family are a good illustration. They have a spacious, comfortable home with every labor-saving device you can think of. There's a washing machine, a clothes dryer, a food processor, a vacuum cleaner and all sorts of other household items which are designed to save time but it seems to me that my daughter and her husband just spend all that "saved" time working! They never relax and are always complaining of being tired and "stressed".
What is the passage mainly about？
A．How life has improved.
B．How life has become worse.
C．A comparison of life now and that in the past.
D．Memory of life in the past.
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What does the woman imply when she says this: Rught. I have done some research on the public schools in the northeastern states, how they’ve been affected by changes in population, uh, immigrant trend
A．She has completed most of the research that was required for her project．
B．She has not done much research yet and so does not mind changing the focus of her project．
C．She is disappointed that the professor is unfamiliar with her research topiC
D．She believes public schools in the northeastern states were only slightly changed due to immigration．
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--Have you ever been to the Great Wall --Yes. I ___ there last year.
A．have gone
B．have been
C．went
D．go
