男性，68岁，反复咳喘20余年，加重4天，嗜睡1天来院。查体：嗜睡，球结膜水肿，皮肤湿暖红润，口唇发绀，BP170/90mmHg（22.7/12kPa），R30次/分，脉搏118次/分，双肺可闻干湿性啰音，双侧腱反射减弱，双下肢可凹性水肿。
为明确诊断应尽快采取以下哪项检查（）。
A.头颅CT
B.血气分析
C.腰穿
D.脑电图
E.血培养+药敏
参考答案：B
 A new study has found no evidence that sunscreen, commonly used to reduce the risk of skin caner, actually increases the risk.Researchers from the University of Yale based their findings on a review of 18 earlier studies that looked at the association between sunscreen use and melanomas (黑素瘤). They said that they found flaws in studies that had reported associations between sunscreen use and higher risk of melanoma.Most health experts believe that by protecting the skin from the harmful effects of the sun, sunscreen helps prevent skin cancer, which is increasing in incidence (发生率) faster than any other cancer in the United States.But questions have been raised about sunscreen and whether it may have the opposite effect, perhaps by allowing people to remain exposed to the sun longer without burning.The researchers said that among the problems with some earlier studies is that they often failed to take into account that those people most at risk for skin cancer—people with fair skin and freckles (雀斑), for example—are more likely to use sunscreen. As a result, it may appear that sunscreen users get cancer more often.The studies, which generally relied on volunteers to recall their sunscreen use, were also unable to prove how well the products had been applied, said the new study.小题1:The underlined word “flaws” in the 2nd paragraph most probably means .
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ed the effect of sunscreen