教材习题点拨

　　WARMING UP

　　Suggested answers include：

　　·If you eat too much energy­giving food you will become fat and suffer from high blood pressure.

　　·If you eat too much body­building food you will grow taller and stronger but not necessarily healthier.

　　·If you eat too much protective food for every meal you may lack energy.However，without protective food(over a long period of time)you can get serious illnesses like scurvy(lack of vitamin C)or rickets(lack of vitamin D)．

　　·If you don't eat enough food of any of the three kinds you may get anorexia(too thin)．

　　PRE­READING

　　Suggested answers to Question 1：

　　A good meal should contain some food from each of the three categories above.

　　COMPREHENDING

　　Answer key for Exercise 1：

　　1．True.

　　2．False.It would take longer than that.

　　3．True.

　　4．False.No.It gave them protective food but no energy­giving or body­building food.

　　5．False.His menu gave customers energy­giving food.

　　6．False.He decided to advertise the benefits of his menu!

　　Suggested answers to Exercise 2

　　1．Li Chang always came to his restaurant so if he did not，it meant that something serious had happened to stop him.

　　2．He did not want Yong Hui to tell lies and people to believe her.

　　3．If he gave his customers cheaper prices and advertised the benefits of his menu，perhaps his customers would return.

Answer key for Exercise 3