阅读理解。
A small piece of fish each day may keep the heart doctor away. That's the finding of a study of
Dutch men in which deaths from heart disease were more than 50 percent lower among those who
consumed at least an ounce (盎司)of salt water fish per day compared to those who never ate fish.
The Dutch research is one of three human studies that give strong scientific support to the long
held belief that eating fish can provide health benefits, particularly to the heart.
Heart disease is the number-one killer in the United States, with more than 550,000 deaths
occurring from heart attacks each year. But previous research has shown the level of heart disease
is lower in cultures that consume more fish than Americans do. There are fewer heart disease deaths,
for example, among the Eskimos of Greenland, who consume about 14 ounces of fish a day, and
among the Japanese, whose daily fish consumption(消费量) averages more than 3 ounces.
For 20 years, the Dutch study followed 852 middle-aged men, 20 percent of whom ate no fish.
At the start of the study, average fish consumption was about two-thirds of an ounce each day, with
more eating lean fish than fatty fish.
During the next two decades, 78 of the men died from heart disease. The fewest deaths were
among the group who regularly ate fish, even at levels far lower than those of the Japanese or Eskimos.
This relationship was true regardless of other factors such as age, high blood pressure, or blood
cholesterol(胆固醇) levels.
1. Which of the following is NOT true according to the passage?
A. The Dutch research has proved that eating fish can help to prevent heart disease.
B. People who regularly eat fish never suffer from heart disease.
C. Heart disease causes more deaths in America than any other disease.
D. There is a low level of heart disease in such countries as Japan and Greenland.
2. The underlined words "lean fish" (paragraph 5) roughly mean "_____".
A. large fish
B. fresh fish
C. fish that live in salt water
D. fish that have little fat
3. The passage is mainly about ______.
A. the high incidence of heart disease in some countries
B. the effect of fish eating on people's health
C. the changes in people's diet
D. the daily fish consumption of people in different cultures
4. We can infer from the passage that there are fewer heart disease deaths _____.
A. in Dutch
B. in America
C. in the countries with high consumption of fish
D. in the countries with good production of fish