题目

Computers are good tools(工具）.The Internet is also good. But some people spend too much time online. They can’t stop. Doctors say this is a new sickness. They call this sickness Internet Addiction Disorder (互联网成瘾症）（IAD). People with IAD are online a lot. They spend hours chatting to their friends or playing online games. Many people with IAD spend more time on the Internet than with family or friends. Some people with IAD even quit(辞掉)their jobs! Do you have IAD? Think about these questions：How many hours a day are you online? Is it a lot or a little? When yo商场销售甲、乙两种商品，它们的进价和售价如下表所示， 进价（元） 售价（元） 甲 15 20 乙 35 43（1）若该商场购进甲、乙两种商品共100件，恰好用去2700元，求购进甲、乙两种商品各多少件？（2）该商场为使销售甲、乙两种商品共100件总利润（利润=售价-进价）不少于750元，且不超过760元，请你帮助该商场设计相应的进货方案．（3）若商场销售甲、一两种商品的总利润（利润=售价-进价）是103元，求销售甲、乙两种商品多少件？