单选题 Why can mobile phone be a much more serious problem?

A、 Because people hate the businessmen using mobiles in public places.
B、 Because the use of mobile phones can be physically harmful.
C、 Because there is strong evidence for the problems of mobiles.
D、 Because people feel their privacy unprotected in a caf6 or restaurant.

【正确答案】 B

【答案解析】[注释] 本句话的关键是正确理解题干中的主要信息：a much more serious problem。本题的依据句是：But there is a much more serious problem．It's possible that mobile phone can heat up the brain because we hold the phone so close to our head．从一般的常识也可以判断出，手机的主要问题是手机的辐射，所以B项选择是最有道理的说法。