下面是一位小学英语老师在课堂中教授现在进行时这一语法项目的话语片断，请根据该片断分析该教师运用了归纳法还是演绎法该方法有何利弊 同学们：我们今天将会学习一种新语法项目：现在进行时，现在进行时是用动词的ING形式表示正在进行的动作，比如： He is singing. She is dancing. Tom is running. Amy is reading.

A. Does yawning increase alertness or physiological activity
B. Does thinking about yawning increase yawning over not thinking about yawning
C. Does the amount of carbon dioxide and oxygen in the air affect the rate at which people yawn
D. Does the rate of breathing affect the rate at which people yawn