Directions:

　　In this part there are three passages and one table, each followed by five questions or unfinished statements. For each of them, there are four choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.

　　Firefighters are often asked to speak to school and community groups about the importance of fire safety, particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in a fire by half, firefighters often provide audiences with information on how to install these protective devices in their homes.

　　Specifically, they tell them these things: A smoke detector should be  placed on each floor of a home. While sleeping, people are in particular danger of an emergent fire, and there must be a detector outside each sleeping area. A good site for a detector would be a hallway that runs between living spaces and bedrooms.

　　Because of the dead-air space that might be missed by hot air bouncing around above a fire, smoke detectors should be installed either on the ceiling at least four inches from the nearest wall, or high on a wall at least four, but no further than twelve, inches from the ceiling.

　　Detectors should not be mounted near windows, entrances, or other places where drafts (过堂风) might direct the smoke away from the unit. Nor should they be placed in kitchens and garages, where cooking and gas fumes are likely to cause false alarms.

　　1. One responsibility of a firefighter is to ______________.

　　A. install smoke detectors in residents' homes

　　B. check if smoke detectors are properly installed

　　C. develop fire safety programs for schools

　　D. speak to residents about how to prevent fires

　　2. Compared with homes without smoke detectors, homes with them give their owners a 50% better chance of ____________.

　　A. surviving a fire B. preventing a fire

　　C. detecting a hidden fire D. not getting injured in a fire

　　3. A smoke detector must always be placed ____________.

　　A. on any level of a home

　　B. outside all bedrooms in a home

　　C. in all hallways of a home

　　D. in kitchens where fires are most likely to start

　　4. The passage implies that dead-air space is most likely to be found  _______________.

　　A. on a ceiling four inches away from a wall

　　B. near an open window

　　C. close to where a wall meets a ceiling

　　D. in kitchens and garages

　　5. What is the focus of this passage?

　　A. How firefighters carry out their responsibilities.

　　B. The proper installation of home smoke detectors.

　　C. The detection of dead-air space on walls and ceilings.

　　D. How smoke detectors prevent fires in homes.

　  DABCB