We are by doctors to eat more natural food and take plenty of physical exercise.A. allowe

问题补充：

We are by doctors to eat more natural food and take plenty of physical exercise.

A. allowed

B. warned

C. taught

D. advised

答案：

A. allowed

B. warned

C. taught

(答案→)D. advised

解析：A.允许；认可 B.警告 C.教 D.建议；劝告。句意：医生建议我们多吃天然食品，多参加体育锻炼。故选D。