2. 外语
  3. Doctors baffled by an unexplained rash on people’s ears or cheeks should be on alert for a skin allergy caused too much【M1】_____

Doctors baffled by an unexplained rash on people’s ears or cheeks should be on alert for a skin allergy caused too much【M1】_____

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问题     Doctors baffled by an unexplained rash on people’s ears or
cheeks should be on alert for a skin allergy caused too much【M1】______
mobile phone use, the British Association of Dermatologists said.
Citing published studies, a group said a red or itchy rash, known as【M2】______
"mobile phone dermatitis(皮炎)," effects people who develop an【M3】______
allergic reaction to the nickel surface on mobile phones after
spending long periods of time on the devices. "It is worth doctors
bear this condition in mind if they see a patient with a rash on the【M4】______
cheek or ear that cannot otherwise be explained," it said. The
British group said many doctors were aware mobile phones could【M5】______
cause the condition. Safety concern over mobile phones has grown
as more people rely on it for everyday communication, although【M6】______
the evidence to date has given the technology a clean bill of health
when it comes to serious conditions like brain cancer. "In mobile
phone dermatitis, the rash would typical occur on the cheek or ear,【M7】______
depending on the metal part of the phone comes into contact with【M8】______
the skin," the group said in a statement. "In theory it could even
occur on the fingers unless you spend a lot of time texting on metal【M9】______
menu buttons."
    Nickel is a metal found in products, and ranging from mobile【M10】______
phones to jewelry to belt buckles and is one of the most common
causes of allergic contact dermatitis, according to the Mayo Clinic
in the United States.
【M1】
选项
答案caused∧—by
解析 语法错误。本句前半部分提及“医生们在发现患者耳部或两颊出现无法解释其原因的皮疹时应当注意皮肤过敏”，接下来出现的caused一词不是谓语，而是过去分词作后置定语修饰skin allergy，表示被动，caused这一动作的执行者应该是后面的too much mobile phone use(过度使用手机)，故此处应加介词by。
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