题目

阅读理解My name is Jim. I'mfrom England. My Chinese teacher is Li Ying. She is a good teacher. I have manyfriends at school. Bob is my best friend. He's from the USA. He's short and hehas yellow hair. Lucy is a tall girl. She likes music. Tom is from Canada. Hehas short brown hair. He likes science. Zhang Mei is from China. She has longblack hair. She speaks English very well. We are good friends. （1） Who's Jim's Chinese teacher? A . Li Ying B . Zhang Mei C . Tom （2） is from England. A . Bob B . Tom C . Jim （3） is short and has yellow hair某旅游商品生产企业，2007年某商品生产的投入成本为1元/件，出厂价为1.2元/件，年销售量为10000件，因2008年调整黄金周的影响，此企业为适应市场需求，计划提高产品档次，适度增加投入成本。若每件投入成本增加的比例为（），则出厂价相应提高的比例为，同时预计年销售量增加的比例为。已知年利润（出厂价投入成本）年销售量。（1）写出2008年预计的年利润与投入成本增加的比例的关系式；（2）为使2008年的年利润达到最大，则每件投入成本增加的比例应是多少？此时最大年利润是多少？