On April 24th , another natural disaster - the oil spill(泄露)in the Gulf of Mexico , happened .
Millions of dollars have been used to help stop the spill and to clean up the animals , beaches , and
land spoiled by the oil . Unfortunately , when many of these chemicals are used , more damage is
caused to the environment , especially to lives in the sea .
But governments seem to accept the risk of transporting millions of tons of oil by ship every day
so that we can fill up our cars and drive around and cause even more environmental damage .
Interestingly , the biggest companies in the world produce cars , and the next biggest supply the
gasoline to make them run .
Of all of today"s environmental disasters , an oil spill may actually be one of the least serious .
Although oil is poisonous , it is a natural material . In the end , it breaks down naturally . In 1967
the tanker Torrey Canyon sank off the Scilly Isles near the coast of England and spilled 120,000
tones of oil into the ocean . If you go there today , you will find it hard to see any sign that it ever
happened .
However , we should be thinking more about reducing our dependency on oil . Governments
should be encouraging research into new technologies , such as cars run by solar power, electricity ,
hydrogen , and so on . Much of this research , in the past , was stopped by the oil , gas , and coal .
If the world"s millions of cars were 10% more efficient(高效的), we would need many fewer tankers
crossing the oceans each year . If this happened , the risks of oil spills would be reduced , and the air
we breathe would be cleaner and fresher , too .
Eating too much fatty food, exercising too little and smoking can raise your future risk of heart disease. But there is
another factor that can cause your heart problems more immediately: the air you breathe.
Previous studies have linked high exposure (暴露)to environmental pollution to an increased risk of heart problem,
but two analyses now show that poor air quality can lead to heart attack or stroke (中风)within as little as a few hours
after exposure. In one review of the research, scientists found that people exposed to high levels of pollutants (污染物)were up to 5% more likely to suffer a heart attack within days of exposure than those with lower exposure. A separate
study of stroke patients showed that even air that the U. S. Environmental Protection Agency (EPA) considers to be of "moderate" (良好)quality and relatively safe for our health can raise the risk of stroke as much as 34% within 12 to 14
hours of exposure.
The authors of both studies stress that these risks are relatively small for healthy people and certainly modest
compared with other risk factors such as smoking and high blood pressure. However, it is important to be aware
of these dangers because everyone is exposed to air pollution regardless of lifestyle choices. So stricter regulation
by the EPA of pollutants may not only improve environmental air quality but could also become necessary to
protect public health.
A. inform
B. persuade
C. describe
D. entertain
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