21、Sarah was ill, she went to see the doctor．

“ Doctor, I’m not feeling well,” she said．“ Every time I do my homework, I feel tired．If I go to school on foot, I have to sit down and rest for ten minutes．”

The doctor looked at her carefully．At last he said, “ Nothing much．But I’m afraid you are eating too much．”

“I don’t understand, what do you mean?”asked Sarah．“I mean you eat too much food,” said the doctor．

“Oh! You mean I’m too fat．That’s a problem．” Said Sarah．“What should I do If I don’t want to be heavy!”

“The answer is easy,” said the doctor．“ If you want to be thin and healthy, you shouldn’t eat a lot of food and you also should do much exercise．”

根据短文内容，选择最佳选项。

(   ) 1．What was the matter with Sarah ? She felt _____ ．

        A．tired．          B．sad．            C．sore in the back    D．hungry

(   ) 2．Sarah went to school _____ ．

        A．by bike        B．by bus         C．by car              D．on foot

(   )3．The doctor told her that _____ ．

A．she must eat much food．      B．she ate too much

C．she was too thin                   D．she was ill

(   ) 4．_____ is a problem．

A． Eating less food．                 B．Being too fat 

C． Working too hard．             D．Playing too much sports

(   )5．Sarah wants to _____ later．

             A．eat a lot of meat                  B．be fat 

C．do more exercise                  D．stay at home for some days