已知定义在实数集R上的函数y=f（x）满足：f（x+y）=f（x）+f（y），且f（x）不恒等于零，则y=f（x）是（　　）

A．奇函数

B．偶函数

C．非奇非偶函数

D．不能确定

Does going to college really pay off？Certainly!

I remember taking __小题1:__ English class in college on the short story. Our first assignment was to read __小题2:__ short stories and then discuss which one was better. After __小题3:__(read)both，I wasn’t sure. Over the __小题4:__ several months, my professor taught me __小题5:_ one story was so much better than the other.__ 小题6:__ was rich in metaphor(隐喻)and character development, _小题7:__ the other was humorous 小题8:_ too shallow. I couldn’t see this at first. Yet,

in a few months, my brain got reeducated and __小题9:__ could see the difference between good and bad writing and could appreciate literature at a whole new level.

Going to college helps build a strong mind, which leads __小题10:__ greater success in one’s life.