22. The world "Advocates" in line 3 is closest in meaning to which of the following？

　　（A） Proponents

　　（B） Merchants

　　（C） Inspectors

　　（D） Consumers

　　23. In line 6， the word "others" refers to

　　（A） advantages

　　（B） advocates

　　（C） organic foods

　　（D） products

　　24. The "welcome development" mentioned in line 8-9 is an increase in

　　（A） interest in food safety and nutritional quality of the typical North American diet

　　（B） the nutritional quality of the typical North American diet

　　（C） the amount of healthy food grown in North America

　　（D） the number of consumers in North America

　　25. According to the first paragraph， which of the following is true about the term "organic foods"？

　　（A） It is accepted by most nutritionists.

　　（B） It has been used only in recent years.

　　（C） It has no fixed meaning.

　　（D） It is seldom used by consumers.

　　26. The word "unsubstantiated" in line 21 is closest in meaning to

　　（A） unbelievable

　　（B） uncontested

　　（C） unpopular

　　（D） unverified

　　27. The word "maintain" in line 28 is closest in meaning to

　　（A） improve

　　（B） monitor

　　（C） preserve

　　（D） restore

　　28. The author implies that there is cause for concern if consumers with limited incomes buy organic foods instead of conventionally grown foods because

　　（A） organic foods can be more expensive but are often no better than conventionally grown foods

　　（B） many organic foods are actually less nutritious than similar conventionally grown foods

　　（C） conventionally grown foods are more readily available than organic foods

　　（D） too many farmers will stop using conventional methods to grow food crops.

　　29. According to the last paragraph， consumers who believe that organic foods are better than conventionally grown foods are often

　　（A） careless

　　（B） mistaken

　　（C） thrifty

　　（D） wealthy

　　30. What is the author s attitude toward the claims made by advocates of health foods？

　　（A） Very enthusiastic

　　（B） Somewhat favorable

　　（C） Neutral

　　（D） Skeptical