第29题: [单项选择]Press a third button so that the alarm is set. A. To set the alarm, you need to press the button three times. B. There are three buttons needed to set the alarm. C. After pressing a third button, you finish setting the alarm. 参考答案:C 答案解析:按第三个按钮,警报便被设定。Third button指的是第三个按钮,不是三次按按钮,当然也不是说只有_一个按钮。