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  3. For years, scientists have been warning us that the radiation from mobile phones is detrimental to our health, without actually

For years, scientists have been warning us that the radiation from mobile phones is detrimental to our health, without actually

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问题     For years, scientists have been warning us that the radiation from mobile phones is detrimental to our health, without actually having any evidence to back these【C1】______up. However research now suggests that mobile phone radiation has at least one positive side effect it can help prevent Alzheimer’s,【C2】______in the mice that acted as test subjects.
    It’s been suspected, though never proven, that heavy use of mobile phone is bad for your health. It’s thought that walking around with a cellphone permanently attached to the side of your head is almost sure to be【C3】______your brain. And that may well be true, but I’d rather wait until it’s proven before giving up that part of my daily life.
    But what has now been proven, in a very perfunctory manner, is that mobile phone radiation can have an effect on your brain. 【C4】______in this case it was a positive rather than negative effect.
    According to BBC News, the Florida Alzheimer Disease Research Center conducted a study on 96 mice to see if the radiation given off by mobile phone could affect the onset of Alzheimer’s.
    Some of the mice were "genetically altered to develop beta-amyloid plagues in their brains"【C5】______they aged. These are a marker of Alzheimer’s. All 96 mice were then "exposed to the lector-magnetic【C6】______generated by a standard phone for two one-hour periods each day for seven to nine months. "The lucky things.
    【C7】______, the experiment showed that the mice altered to be predisposed to dementia were protected from the disease if exposed before the onset of the illness. Their cognitive abilities were so unimpaired as to be virtually【C8】______to the mice not genetically altered in any way.
    Unfortunately, although the results are positive, the scientists don’t actually know why exposed to mobile phone radiation has this effect. But it’s hoped that further study and testing could result in a non-invasive【C9】______for preventing and treating Alzheimer’s disease.
    Autopsies carried out on the mice also concluded no ill-effects of their exposure to the radiation. However the fact that the radiation prevented Alzheimer’s means mobile phones【C10】______our brains and bodies in ways is not yet explored. And it’s sure there are negatives as well as this one positive.  
【C4】
选项 A、Except
B、Even
C、Despite
D、Besides
答案A
解析 此题考查上下文语义。第二段提到过度使用手机会让大脑感到疲劳，第三段but话锋一转，讲到手机对大脑有好的影响。根据这个语义走向可判断，作者想表达除了这个情况手机辐射能产生正面效果，其他情况下则都是负面作用。因此这里选用except，表示前后关系是对立的。
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