某小型开关厂今年准备投入一定的经费用于现有生产设备的改造以提高经济效益．通过测算：今年开关的年产量y（万只）与投入的改造经费x（万元）之间满足3﹣y与x+1成反比例，且当改造经费投入1万元时，今年的年产量是2万只．

（1）求年产量y（万只）与改造经费x（万元）之间的函数解析式．（不要求写出x的取值范围）

（2）已知每生产1万只开关所需要的材料费是8万元，除材料费外，今年在生产中，全年还需支付出2万元的固定费用。

①求平均每只开关所需的生产费用为多少元？（用含y的代数式表示） （生产费用=固定费用+材料费）

②如果将每只开关的销售价定位“平均每只开关的生产费用的1.5倍”与“平均每只开关所占改造费用的一半”之和，那么今年生产的开关正好销完，问今年需投入多少改造经费，才能使今年的销售利润为9.5万元？ （销售利润=销售收入-生产费用﹣改造费用）

A study comparing a group of chronically depressed individuals with an otherwise matched group of individuals free from depression found significantly more disorders of the immune system among the depressed group. According to the researchers, these results ply support the hypothesis that mental states influence the body’s vulnerability to infection. Which of the following, if true, casts the most serious doubt on the researchers’ interpretation of their findings

A．The researchers’ view does little more than echo a familiar theme in folklore and literature.

B．Chronically depressed individuals are no less careful than others to avoid exposure to infections.

C．Disorders of the immune system cause many of those individuals who have them to become chronically depressed.

D．Individuals who have previously been free from depression can become depressed quite suddenly.

E．(E) A high frequency of infections can stem from an unusually high level of exposure rater than from any disorder of the immune system.