题目内容
Dirty
Before the grass has thickened on the roadside and leaves have started growing on the trees is a perfect time to look around and see just how dirty
The problem is that the rubbish created by our increasingly mobile lives lasts a lot longer than before. If it is not cleared up and properly thrown away, it stays in the bushes for years; a
semi-permanent reminder of what a shabby little country we have now. Firstly, it is estimated that 10 billion plastic bags have been given to shoppers. These will take anything from 100 to 1,000 years to rot. However, it is not as if there is no solution to this. A few years ago, the Irish government introduced a tax on non-recyclable carrier bags and in three months reduced their use by 90%. When he was a minister, Michael Meacher attempted to introduce a similar arrangement in
What is clearly necessary right now is some sort of combined initiative, both individual and collective, before it is too late. The alternative is to continue sliding downhill until we have a
country that looks like a vast municipal rubbish tip. We may well be at the tipping point. Yet we know that people respond to their environment. If things around them are clean and tidy, people behave cleanly and tidily. If they are surrounded by dirt, they behave dirtily. Now, much of
76. The writer says that it is a good time to see
A. Britain looks perfect. B. you can see
C. you can see how dirty
77 . According to the writer, the major problem is that __________.
A. rubbish can not be cleared up B. rubbish lasts longer than it used to
C. our society is increasingly mobile D. people in
78. What can be learned about Michael Meacher?
A. He followed the Irish example with a tax on plastic bags.
B. He failed in his attempt to introduce a tax on plastic bags.
C. His attempt to follow the Irish example with a tax on plastic bags was welcomed.
D. He had problems with the plastics industry who weren’t bothered about the tax.
79. What does the writer state in the last paragraph?
A. It’s too late for people to take immediate action.
B. There is more than one solution to the problem.
C. Britain will become an extremely dirty country in five years.
D. People tend to behave according to what they see around them.
C B B D
A. deadly B. tested C . identified D. activity E. independently F. resistance G. treat H. lifelong I. highly J. seasonal |
Evidence is increasing that common influenza viruses are becoming resistant to the main drug used to treat them. The drug is oseltamivir, also known as Tamiflu.
The most common ___41___ flu virus found in the
The research team is reporting its findings in the Journal of the American Medical Association. Alicia Fry led the team. Doctor Fry says it is better to prevent the flu than to have to ___45___ it. And the best form of prevention, she says, is getting vaccinated (进行预防接种) each year against influenza.
Viruses change, or mutate, (变异) so flu vaccines must be reformulated each year to target the most common threats.
But last week, two teams working ___46___ reported a discovery that could help lead to a universal flu vaccine. The hope is to develop a vaccine that could give ___47___ protection against a majority of flu viruses, including bird flu.
The scientists ___48___ a protein that inactivates the flu virus before it can mutate.
One team used an antibody found in blood donated by an individual. Scientist Ian Wilson at the Scripps Research Institute in
Beyond two or three days, the world’s best weather forecasts are doubtful, and beyond six or seven they are worthless.
The Butterfly Effect is the reason. For small pieces of weather―to a global forecaster, small can mean thunderstorms and blizzards (暴风雪)―any prediction becomes worse rapidly. Errors and uncertainties increase, from dust devils and storms up to continent-size eddies (旋涡) that only satellites can see.
The modern weather models work with net-like points sixty miles apart, and even so, some starting data have to be guessed, since ground stations and satellites cannot see everywhere. But suppose the earth could be covered with sensors placed one foot apart, rising at one-foot intervals all the way to the top of the atmosphere. Suppose every sensor gives perfectly accurate readings of temperature, pressure, humidity (湿度), and any other data a weatherman would want. Exactly at noon a powerful computer takes all the data and calculates what will happen at each point at 12.01, then 12.02, then 12.03… the computer will still be unable to predict whether Princeton will have sun or rain one month away. At noon the spaces between the sensors will hide fluctuations (波动) that the computer will not know about. By 12.01, those fluctuations will already have created small errors one foot away. Soon the errors will have added to the ten-foot scale, and so on up to the size of the globe.
72.A weather forecast ______ in the world.
A.is reliable within one or two days
B.is doubtful beyond 24 hours
C.becomes useless beyond two or three days
D.is still worthwhile in seven days
73.Usually there is a weather sub-station ______.
A.in every city B.every 60 miles
C.between two cities D.every one foot
74.Which of the following statements is true?
A.People have not placed sensors one foot apart in the atmosphere.
B.Scientists have already put sensors one foot apart in the world.
C.Every sensor gives perfectly accurate data a weatherman wants.
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75.Our computer will not be able to know about fluctuations because ______.
A.the sensors are not good enough
B.they are hidden by the spaces between the sensors
C.they are too far away
D.they move very fast