题目

I teach biology at UNLV three times per week. Last Monday, at the beginning of class, I cheerfully asked my   1   how their weekend had been. One young man said that his weekend had not been so   2  . He had his wisdom teeth removed. Then he went on to ask me why I always seemed to be so   3  . His question   4   me of something I'd read somewhere before: “Every morning when you get up, you have a   5   about how you want to deal with life that day,” I said. “I choose to be cheerful.”  “Let me give you an example,” I   6  , addressing (对...强调)all小明从远处向墙上的平面镜走近，则他在平面镜中的像大小（   ）A．变大B．不变C．变小D．先变小后变大选择理由：_____________________________________________________________