Drug Reactions--a Major Cause of Death Adverse drug reactions may cause the deaths of over 100,000 US hospital patients each

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问题                  Drug Reactions--a Major Cause of Death
    Adverse drug reactions may cause the deaths of over 100,000 US hospital patients each year, making them a leading cause of death nationwide, according to a report in the Journal of the American Medical Association.
    "The incidence of serious and fatal adverse drug reactions (ADRs) in US hospitals was found to be extremely high. " say researchers at the University of Toronto in Ontario, Canada.
    They carried on an analysis of 39 ADR-related studies at US hospitals over the past 30 years and defined an ADR as "any harmful, unintended, and undesired effect of a drug which occurs at doses used in humans for prevention, diagnosis, or therapy. "
    An average 6.7% of all hospitalized patients experience an ADR every year, according to the researchers. They estimate that " In 1994, overall 2,216,000 hospitalized patients had serious ADRs, and 106,000 had fatal ADRs. " This means that ADRs may rank as the fourth single largest cause of death in America.
    And these incidence figures are probably conservative, the researchers add, since their ADR, definition did not include outcomes linked to problems in drug administration, overdoses, drug abuse, and therapeutic failures.
    The control of ADRs also means spending more money. One US study estimated the overall cost of treating ADRs at up to $ 4 billion per year.
    Dr. David Bates of Brigham and Women’s Hospital in Boston, Massachusetts, believes that healthcare workers need to pay more attention to the problem, especially since many ADRs are easily preventable. "When a patient develops an allergy or sensitivity, it is often not recorded, " Bates notes, "and patients receive drugs to which they have known allergies or sensitivities with disturbing frequency. " He believes computerized surveillance systems--still works-in-progress at many of the nation’s hospitals--should help cut down the frequency of these types of errors.  
Researchers at the University of Toronto believe that ______.

选项 A、ADRs have caused medical problems, though they seldom lead to death
B、ADRs have very often caused patients to die in Canada
C、ADRs have caused many deaths in America over the past 30 years
D、it is easy to prevent ADRs from happening

答案C

解析 本文第一段第一句话就提到了ADR可能造成死亡,第二段和第四段中都 用fatal(致命的)一词来说明ADR,并且这种现象在美国很严重,因此选项A是错误的。选项B也是错误的,因为文中并没有提到在加拿大ADR引起死亡的情况;选项D与文章最后一段的贝茨医生所说的话相符合,但文中并没有提到加拿大的研究者也说过这样的话,所以也不是正确的选项。只有C与题意一致。
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