l not produce conclusive results花费时间而且产生的结果不确定。take a long time = take time; often raise more question than they answer = will not produce conclusive results.
[干扰项分析] A) often result in misleading conclusions经常导致误导性的结论，错在misleading无信息支持；C) should be conducted by scientists on a larger scale应该由医生更大规模地进行，也无信息支持；D) appear to be a sheer waste of time and resources 看起来是纯粹浪费时间和资源，无信息支持，说的太过了。
The best evidence to date concerns folate, one of the B vitamins. It’s been proved to limit the number of defects in embryos (胚胎), and a recent trial found that folate in combination with vitamin B12 and a form of B6 also decreases the re-blockage of arteries after surgical repair.
The news on vitamin E has been more mixed. Healthy folks who take 400 international units daily for at least two years appear somewhat less likely to develop heart disease. But when doctors give vitamin E to patients who already have heart disease, the vitamin doesn’t seem to help. (23) It may turn out that vitamin E plays a role in prevention but cannot undo serious damage.
23. It has been found that vitamin E .
[定位与替换]根据关键词vitamin E定位到第四段。考生对阅读文章中出现的某个概念要及时做标记，根据前面对段落的分析，应该选 C) has a preventive but not curative effect on heart disease有预防但没有治愈心脏病的效果。
[干扰项分析] A) should be taken by patients regularly and persistently应该有规律并且坚持被病人所服用；B) can effectively reduce the recurrence of heart disease能够有效地减少心脏病的复发；D) should be given to patients with heart disease as early as possible 应该被尽早地给予患心脏病的人。这三个干扰项均无信息支持。本题只要定位准确，应该很容易解答。
Despite vitamin C’s great popularity, consuming large amounts of it still has not been positively linked to any great benefit. The body quickly becomes saturated with C and simply excretes (排泄) any excess.
The multivitamins question boils down to this: Do you need to wait until all the evidence is in before you take them, or are you willing to accept that there’s enough evidence that they don’t hurt and could help?（第一个that引导宾语从句作accept的宾语，第二个that引导同位语从句作evidence的同位语）
If the latter, there’s no need to go to extremes and buy the biggest ‘horse pills or the most expensive bottles. (24) Large doses can cause trouble, including excessive blee
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