khoahoc.vietjack.com

Danh sách câu hỏi ( Có 2,573,043 câu hỏi trên 51,461 trang )

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well, especially cancer of the colon. People of different cultures are more prone to contact certain illnesses because of the characteristic foods they consume.That food is related to illness is not a new discovery. In 1945, government researchers realized that nitrates nitrites (commonly used to preserve color in meat) as well as other food additives caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which ingredients on the packaging label of processed food are helpful or harmful. The additives that we eat are not all so direct. Farmers often give penicillin to cattle and poultry, and because of this, penicillin has been found in the milk of treated cows.Sometimes similar drugs are administered to animals not for medical purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration (FDA) has tried repeatedly to control these procedures, the practices continue.A healthy diet is directly related to good health. Often we are unaware of detrimental substances we ingest. Sometimes well-meaning farmers or others who do not realize the consequences add these substances to food without our knowledge. How has science done to disservice to people?

Xem chi tiết 507 lượt xem 3 năm trước

Complete the following passage by choosing A, B, C or D to fill in each blank. Recent research has (1)____ that a third of people in Britain have not met their (2)____neighbors, and those who know each other (3) _____ speak. Neighbors gossiping over garden fences and in the street was a common (4)_____ in the 1950s, says Dr Carl Chinn, an expert on local communities. Now, however, longer hours spent working at the office, together with the Internet and satellite television, are eroding neighborhood (5)_____ . "Poor neighborhoods once had strong kinship, but now prosperity buys privacy," said Chinn.Professor John Locke, a social scientist at Cambridge University, has analyzed a large (6)_____ of surveys. He found that in America and Britain the amount of time spent in social activity is decreasing. A third of people said they never spoke to their neighbors at (7)_____. Andrew Mayer, 25, a strategy consultant, rents a large apartment in West London, with two flat mates, who work in e – commerce. "We have a family of teachers upstairs and lawyers below, but our contact comes via letters (8)_____ to the communal facilities or complaints that we've not put out our bin bags properly," said Mayer. The (9)_____ of communities can have serious effects. Concerned at the rise in burglaries and (10)_____ of vandalism, the police have relaunched crime prevention schemes such as Neighborhood Watch, call on people who live in the same are to keep an eye on each others' houses and report everything they see which is unusual.

Xem chi tiết 1.2 K lượt xem 3 năm trước