A、Talk less. B、Change the surroundings. C、Eat food of good quality. D、Take plenty of exercise. C细节题。考查是否听懂医生的建议：改变环境，少讲话，多运动，减少体

Mr. Smith was a wealthy industrialist, but he was not satisfied with life. He did not sleep well and his food did not agree with him. This situation lasted for some time. Finally, after several sleepless nights, he decided to consult his doctor. The doctor advised a change of surrounding.
    "Go abroad," he said. "But I’m no good at foreign language," said Mr. Smith. "It doesn’t matter," said the doctor. "It won’t hurt you to talk a little less. Go on a voyage. Take plenty of exercise. Try to reduce your weight. Avoid rich food."
    Mr. Smith went to Switzerland. He did not know French or German, and had to communicate through gestures. He attended a physical training course. The instructor made him bend his knees, swing his arms, stretch his neck and shake his head rapidly. He had to lie on the ground and raise his right and left legs alternately. After a time his muscles grew hard and firm. He forgot the financial crisis and the importance of raising the level of production. He even began to notice individual trees and individual birds.