单选题
Mr. Smith works in a machine factory. There he
drives a truck. He's busy all the time and can't do any housework. His wife is a
doctor and likes to keep all the things tidy and clean. She usually goes to work
from Monday to Friday and has to do all the housework on Saturdays. All her
friends know about it and sometimes they come to help her. Last
Saturday Mr. Smith had something to do and he left a lot of dirty clothes at
home. Mrs. Smith didn't go to work, but she was a little ill. So she didn't want
to do anything. After breakfast, Mary, one of her friends, came to see her when
she was sitting on a chair. The girl found rooms were dirty and
asked, "Don't you clean your room today, Mrs. Smith ?" "No, I
don't. " Said the doctor. "Why don't you wear
glasses?" "This way I'll think the rooms are tidy and
clean!"