阅读理解

    Mr. Clark likes all kinds of delicious food, and he often has dinner out with his friends. Now Mr. Clark is getting fatter and fatter. He can hardly climb up the stairs (楼梯) at home and has to sleep downstairs. He often feels bad when he walks or does some housework. He is very worried. So he goes to see the doctor.

    "Don't eat too much any more," says the doctor, "and you will be better!" But it is difficult for Mr. Clark to do so. He doesn't want to listen to the doctor. A few months later, he goes to see the doctor again.

    "You must lose weight, Sir," says the doctor. "Move your head from one side to the other side when your friends ask you to have dinner out!"