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?       

If the latter, there's no need to go to extremes and buy the biggest horse pills or the most expensive bottles. Large doses can cause trouble, including excessive bleeding and nervous system problems.

Multivitamins are no substitute for exercise and a balanced diet, of course. As long as you understand that any potential benefit is modest and subject to further refinement, taking a daily multivitamin makes a lot of sense.

21. At one time doctors discouraged taking multivitamins because they believed that multivitamins      .
    A) could not easily be absorbed by the human body  
    B) were potentially harmful to people's health
    C) were too expensive for dally consumption
    D) could not provide any cure for vitamin deficiencies

22. According to the author, clinical trials of vitamin supplements       .
    A) often result in misleading conclusions
    B) take time and will not produce conclusive results
    C) should be conducted by scientists on a larger scale
    D) appear tm be a sheer waste of time and resources

23. It has been found that vitamin E        .
    A) should be taken by patients regularly and persistently
   

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