题目内容：

    When the sun goes down and the sky turns dark， people go back home．For them，this is the end of the day． But this is not the end of the day for some people．For them，work is just starting because they are night workers．When almost all people are sleeping， night workers are working hard．．

Betty's sister is a nurse．She works in a large hospital．Every month she works at night for ten days．She starts to work at 9o'clock in the evening and finishes it at 6o'clock in the morning． She says，"I have lunch between two and three o'clock in the morning．" Andy's uncle works at the fire station（消防局）at night．Tonight he may drive to a house to put out a fire．

There are policemen who work at night．Some of them drive through the streets．They watch carefully．They say to themselves，"Is everything all right？" Many guards（护卫）work at night．They guard houses， buildings and factories．Many newspapermen work at night． They write news and stories for the morning newspapers．And there are soldiers who do not sleep at night． They guard our country for us．

Night workers finish their work when the sun comes up．On their way home，they meet the day workers who are just starting their work．We must remember that there are many night workers around us．They work hard when we sleep．

1.This passage is about     ．

A. all kinds of jobs

B. nurses and policemen

C. policemen and newspapermen

D. people who work at night

2.Night workers start their work     ．

A. when the sun comes up

B. when they day workers finish their work

C. when the day workers fall asleep

D. at 9：00in the morning

3.Betty's sister works     ．

A. every night

B. at a fire station

C. ten days a month as a night worker

D. for twelve hours at night

4."to put out a fire" in the second paragraph means     ．

A. to stop a fire from burning

B. to move a fire to another place

C. to look at a fire

D. to make a fire

5.Which of the following is not true？    

A. Some nurses are night workers．

B. Many newspapermen work at night．

C. Many guards work at night．

D. Policemen only work at night．