20. Why was the symbol of the Red Cross designed with a red cross on a white ground?    C)

Part II    Reading Comprehension

Passage One

(21) For years, doctors advised their patients that the only thing taking multivitamins does is give them expensive urine(尿). After all, true vitamin deficiencies are practically unheard of in industrialized countries. Now it seems those doctors may have been wrong. The results of a growing number of studies suggest that even a modest vitamin shortfall can be harmful to your health. Although proof of the benefits of multivitamins is still far from certain, the few dollars you spend on them is probably a good investment.（文章一开始提出老观点，认为服用的维生素人体难吸收。然后给出新看法，也就是服用适量的维生素是有益的。从结构上讲是应该典型的新老观点型文章，整篇文章围绕着新观点展开。deficiency / shortfall同义替换）

21. At one time doctors discouraged taking multivitamins because they believed that multivitamins      .
[定位与替换]本题是问医生曾经不鼓励服用多种维生素的原因。根据题干中的At one time和doctors可以定位到文章第一段的第一句，At one time = For years。第一句的意思是多年来医生忠告他们的病人，服用多种维生素的唯一作用是排泄昂贵的药。句子主干是doctors advised their patients, that引导主语从句。言外之意思是，花了钱却排泄掉了，正符合A) could not easily be absorbed by the human body不能轻易地被身体所吸收，属于概括性替换。原文是排泄，答案是吸收，一正一反。

[干扰项分析]  B) were potentially harmful to people’s health对人的身体有潜在的危害，原文无信息支持；C) were too expensive for daily consumption对于日常消费是太昂贵了, 是曲解原文，原文中的expensive是修饰的尿而不是维生素，只是说明花钱服用后排泄掉了，是一种浪费。这个选项有很大的迷惑性；D) could not provide any cure for vitamin deficiencies不能对维生素缺乏症提供任何治疗，利用第二句中的vitamin deficiencies来干扰考生。

Or at least that’s the argument put forward in the New England Journal of Medicine. (22) Ideally, say Dr. Walter Willett and Dr. Meir Stampfer of Harvard, all vitamin supplements would be evaluated in scientifically rigorous clinical trials. But those studies can take a long time and often raise more questions than they answer.   At some point, while researchers work on figuring out where the truth lies, it just makes sense to say the potential benefit outweighs the cost.

22. According to the author, clinical trials of vitamin supplements       .
[定位与替换]本题针对维生素补剂的临床实验提问。根据题干中的clinical trials可以定位到文章第二段。第三句的意思是，这些实验研究耗费时间长，而且所引起的疑问要比能够回答的疑问多。所以选 B) take time and wil

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