单元限时练2 A（Word练习）-【优化指导】2023-2024学年新教材高中英语必修第一册（北师大版2019）

单元限时练(二)　A卷 (限时 40分钟) Ⅰ.阅读理解 A A small piece of fish each day may keep the heart doctor away.That's the finding of a study of Dutchmen in which deaths from heart disease were more than 50 percent lower among those who consumed at least an ounce 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 that 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 average more than 3 ounces. For 20 years, the Dutch study followed 852 middleaged 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 men 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. [语篇解读]　本文是一篇说明文，吃鱼对人的健康有好处，尤其是有助于降低心脏病的风险。 1．The passage is mainly about . A．the high incidence of heart disease in some countries B．the changes in people's diet C．the daily fish consumption of people in different cultures D．the effect of fish eating on people's health D　[主旨大意题。本文是一篇说明文，主要介绍了吃鱼对人的健康有很大的好处。根据文章第一段可知，D为正确选项。] 2．We can infer from the passage that there are fewer heart disease deaths . A．in the countries of the yellow－skin race B．in the countries with high con