Americans, especially those from less wealthy families, are suggested by some experts to eatmore fresh fruit and vegetables rather than processed foods.

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【定位】根据题目中的fresh fruit and vegetables和processed foods可将本题出处定位于[B]段最后一句。
【解析】[B]。[B]段开头指出预算有限的家庭会怀疑有机食品是否真的值那么高的价格，然后指出目前也没有足够的证据表明食用有机食品可以更健康。最后一句提到，鉴于此，专家建议多吃新鲜的水果和蔬菜，少吃加工食品。题目是对该句的同义转述。

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1 Janet H. Silverstein is skeptical about the idea of eating more organic food.

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2 Questions are based on the following passage.
Basically, there are three types of fatigue: Physical, pathological (由疾病引起的), and psychological. As you might suspect, each differs significantly from the others.
When you exercise your body you produce waste products. Muscles, for example, discard lactic acid (乳酸) into the blood; cells dump in carbon dioxide. When these wastes reach a certain level in the blood, the brain is notified and your activity level drops. Excess wastes in the muscles may produce soreness. If the blood of a physically fatigued animal is injected into a rested animal,it will produce fatigue. The solution to this type of fatigue is simple - rest. That should revive you;if it doesn't, another cause should be sought.
Have you ever become involved in so many activities that you had to be in two places at once? This is what happens when your body has a disease. The cells are overtaxed and cannot keep up with both fighting the disease and keeping you active. The result is fatigue. Some communicable diseases like the flu and colds are notorious for draining your energy. Other non-communicable diseases, like anemia (贫血), drain you because you are lacking an important body ingredient. Being overweight can cause pathological fatigue. It should be obvious that this type of fatigue is not going to go away without treatment. In a way, pathological fatigue is a lifesaver. It lets you know something is wrong and that you need rest. Even a poor diet can produce pathological fatigue. Frequently, people who go on crash diets develop pathological fatigue, and if the diet is not improved, they may do physical harm to their bodies.
Here is the most common type of fatigue. Almost everybody experiences it now and then. Often, the cause is an emotional war you are waging with yourself or those around you. Some of these familiar factors can bring on psychological fatigue: Worries, stress, lack of exercise, boredom,depression. If you know someone with psychological fatigue, would you advise him to rest? No way! That might be fine for our other types of fatigue, but for this one, it's deadly. If you are ever going to be able to cope with stress, depression, or worry, you need oxygen in your cells and a more optimistic attitude. Get out of the chair and do something! Believe it or not, many people throw themselves into physical labor like cleaning or carpentry (木工活) to "defatigue" themselves.If you find yourself in a particularly stressful situation that you can't physically escape, escape mentally. When fatigue continues, maybe you need to get to the root of the problem.
Physical fatigue is usually caused by _________.

A．transmittable diseases

B．too many viruses

C．lack of physical exercise

D．excess wastes in the bloodstream

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3 We learn from the passage that pathological fatigue happens when _________.

A．you have to be in two places at once

B．the cells are subject to an excessive burden

C．the body is free from diseases

D．you are involved in too many activities

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