题目内容
（请给出正确答案）
A.增加
B.减少
C.不变
D.先减后增
参考答案
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（由简答题聘请的专业题库老师提供的解答）
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更多“随着产量的增加，短期平均固定成本（）。”相关的问题
A．两曲线最终会相交 B．两曲线最终会合并成一条曲线
C．两曲线的垂直距离会越来越小 D．两曲线的垂直距离会越来越大
But as months went by, a change came into our friendship. Jerry almost stopped coming by the house, and every time I went to his house or telephoned, he put me off with some excuses such as "I'm studying now" or "I've got some jobs to do for Mum". When we passed on the street, he would still give me a warm smile and friendly wave with a "Hi, kid", but he would hardly ever stop to talk. Finally I realized that he was no longer interested in me and that his，taste had changed. I noticed him with a girl once in a while and several times saw him going out in his family's car on a Friday or Saturday night. I simply couldn't understand what was so great about girls and parties.
But I was hurt when he finally made me know that our friendship was at an end. Of course he didn't really mean to hurt me, but it was a long time before I realized that it was an age problem that caused the break. There were a world of differences between the ideas and interests of a 17-year-old and a 12-year-old. Now that I'm over sixteen myself, I realized this, and the hurt I got then has become happy memories of the good times we were once together. I wonder if millions of other boys and girls have had a similar experience.
(1)、When the writer and Jerry first met, Jerry was ______.
A：10 years old
B：5 years older than the writer
C：of the same age as the writer
D：the writer's classmate
(2)、Their friendship lasted for ______.
A：a few years
B：a few weeks
C：a few months
D：a few hours
(3)、Jerry stopped playing with the writer because ______.
A：the writer had changed
B：he was busy with his study
C：he has some jobs to do
D：he was not interested in the writer
(4)、When a change came in their friendship, the writer ______.
A：accepted it at once
B：couldn't understand his friend for a long time
C：stopped visiting his friend
D：started going to parties with girls
(5)、The main idea of the passage is that ______.
A：the age difference plays a part in friendship
B：friendship is the most important thing for children
C：many boys and girls have a similar experience as the writer
D："friends are made in wine and tested in tears"
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