单选题
A big problem facing people today is that ______.
A、
they must tolerate phone disturbances or miss important calls
B、
they must turn off their phones to keep their homes quiet
C、
they have to switch from a desktop phone to a cellphone
D、
they are too busy to make phone calls
【正确答案】
A
【答案解析】
文章第一句就给出了答案：人们太忙了，不能被连续不断的电话骚扰，因此就要关闭手机。故答案为A。
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