[单项选择]It is implied that a modem farmer cannot simply move to another place when his field has become tired. This is because ______.


A. the production power of a new field is not higher than that of an old one
B. it takes a farmer more than ten years to cultivate a new field
C. the population of the world has increased rapidly
D. there will be too many grasses in a new field to grow crops

One silly question I simply cannot bear is "How do you feel" Usually the question is asked of a man in action -- a man walking along the street, or busily working at his desk. So what do you expect him to say He’ll probably say, "Fine, I’ m all right." But you have put a bug in his ear -- maybe now he is not sure. If you are his good friend, you may have seen something on his face, or in his walk, that he overlooked that morning. It makes him worrying a little. He looks in a mirror to see if everything is all right, while you go merrily on your way asking someone else, "How do you feel"
Every question has its time and place. It’ s perfectly acceptable, for example, to ask "How do you feel" if you are visiting a close friend in the hospital. But if the fellow is walking on both legs, hurrying to take a train or sitting at his desk working, it’ s no time to ask him that silly question.
When Geor
A. The bug in his ear.
B. The question "How do you feel "
C. Something in a mirror.
D. A problem.