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标题: last-7-1-10 [打印本页]

作者: 好好学习 时间: 2004-4-3 07:24
标题: last-7-1-10

A large group of hyperactive children whose regular diets included food containing large amounts of additives was observed by researchers trained to assess the presence or absence of behavior problems. The children were then placed on a low-additive diet for several weeks, after which they were observed again. Originally nearly 60 percent of the children exhibited behavior problems; after the change in diet, only 30 percent did so. On the basis of these data, it can be concluded that food additives can contribute to behavior problems in hyperactive children.

The evidence cited fails to establish the conclusion because

(A) there is no evidence that the reduction in behavior problems was proportionate to the reduction in food-additive intake

(B) there is no way to know what changes would have occurred without the change of diet, since only children who changed to a low-additive diet were studied

(C) exactly how many children exhibited behavior problems after the change in diet cannot be determined, since the size of the group studied is not precisely given

(D) there is no evidence that the behavior of some of the children was unaffected by additives

(E) the evidence is consistent with the claim that some children exhibit more frequent behavior problems after being on the low-additive diet than they had exhibited when first observed

答案B。如何理解请高手指教！谢谢

作者: 费希 时间: 2004-4-3 13:18
我来试一下，原文没说在其他条件不变的情况下改变diet，有可能不是diet的原因.

请指教！

作者: 好好学习 时间: 2004-4-3 23:29
能不能解释得更详细些？谢谢

作者: 番茄炒蛋 时间: 2004-4-5 20:54

这里说的其实就是生物学中一个非常浅显的道理

对比试验

举个梨子

有人开始吃了个鸡蛋，结果生了孩子

结论，吃了鸡蛋就会生孩子

呵呵，当然不对，再找一个人不吃鸡蛋，她也生了孩子

原文就是这个道理，一定要有一个对比的东西存在在那里，这样才能更说明问题

作者: 好好学习 时间: 2004-4-6 03:55

番茄炒蛋

高人啊

作者: 番茄炒蛋 时间: 2004-4-6 11:13

呵呵，惭愧

大家一起讨论问题了

别这样说了

作者: linchechin 时间: 2004-4-11 02:57

番茄炒蛋的邏輯功夫真高啊!!!!小弟效法中!!!

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