【单选题】{{B}}Passage Two{{/B}}
Though the public increasingly demands no-risk food, there is no such thing.BruceAmes, chairman of the biochemistry department at the University ofCalifornia,Berkeley, points out that up to 10% of a plant’s weight is made up of natural pesticide (杀虫剂). Says he. "Since plants do not have jaws or teeth to protect themselves, they employ chemical warfare."And many naturally produced chemicals, though occurring in tiny amounts, prove in laboratory tests to be strong carcinogens—a substance that can cause cancer. Mushrooms (蘑菇) might be banned if they were judged by the same standards that apply to food additives (添加剂) .DeclaresChristina Stark, a nutritionist atCornell University: "We’ve got far worse natural chemicals in the food supply than anything man-made.
Yet the issues are not that simple. WhileAmericans have no reason to be terrified to sit down at the dinner table, they have every reason to demand significant improvements in food and water safety. They unconsciously and unwillingly take in too much of too many dangerous chemicals. If food already contains natural carcinogens, it does not make much sense to add dozens of new man-made ones. Though most people will withstand the small amounts of contaminants generally found in food and water, at least a few individuals will probably get cancer one day because of what they eat and drink.
To make good food and water supplies even better, the Government needs to tighten its regulatory standards, stiffen its inspection program and strengthen its enforcement policies. The food industry should modify some long-accepted practices or turn to less hazardous alternatives. Perhaps most important, consumers will have to do a better job of learning how to select and cook food properly. The problems that need to be tackled exist all along the food-supply chain, from fields to processing plants to kitchens.
B．plants produce certain chemicals to combat pests and diseases
C．farmers use chemicals to protect plants against pests and diseases
D．farmers use man-made chemicals to dissolve the natural chemicals in plants
网考网参考答案：B
网考网解析：
原文的句意是“因为植物没有坚硬的利齿来保护自己，所以它们只能使用化学(武器)来战斗”，也就是“这些植物会生成某种化学物来抗病抗虫”。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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