【单选题】Linda spends her entire budget and consumes 15 units of x and 19 units of y. The price of x is twice the price of y. Her income doubles and the price of y doubles, but the price of x stays the same. I...
【简答题】阅读理解。 Linda Brown works for a big company. Her job is very important, so she has to work a lot-often 60 or 70 hours a week. Linda doesn't like to rest. She never takes vacations. In the morning, after...