目前，教师供给中的首要问题是（）。

听力原文：M: Do you like dancing?W: Yes, very much. Do you dance?M: I used to dance when I was younger, but not very often now. I'm getting too old.W: Too old? Nonsense, you don't look more than fifty.W: As a matter of fact, I'm nearly sixty.W: Really! You certainly don't look it.M: As it happens, today is my birthday.W: Is that so? Well, many happy returns of the day.M: Thank you very much.(12)A．In his thirties.B．About fifty.C．A little less than sixty.D．More than sixty. 点击查看答案

在现代化生产发展的条件下，社会经济增长和社会生产力的发展，主要依靠（）。

A．增加劳动数量
B．增加劳动强度
C．提高社会劳动生产率
D．延长劳动时间

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