Ⅲ. 阅读理解（共15题；每题2分，满分30分）
A
House fires cause many deaths each year. You should have a smoke alarm outside each bedroom and on each floor of your home. The main job of such an alarm is to protect you while you're asleep. You ought to have two plans for getting out of your house if there is a fire and practice these plans in the dark with your family.
A smoke alarm warns you of the danger. But when you hear it, you don't have much time. Take action immediately. When you come to a closed door, check it with the back of your hand. If it feels hot, there may be smoke or fire behind the door, so take care. Once you are out of your house, call the fire department. If a family member or a pet is caught inside, you shouldn't go back in. Firemen know how to perform rescues safely.
Change the batteries at least once a year. You should use the test button each month to see if the alarm and batteries are still working. A smoke alarm lasts about ten years. You ought to change it even if it seems to be working.
21. What is the main purpose of a smoke alarm according to the passage?
A. To help people call the fire department quickly.
B. To protect people when they are asleep.
C. To guide people to find a pet trapped inside.
D. To check if the door is hot during a fire.
22. What should you do first when you hear the smoke alarm?
A. Go back inside to save your pet.
B. Check all the doors with your hand.
C. Take immediate action to get out.
D. Call the fire department from your home.
23. How often should you replace the batteries of a smoke alarm?
A. At least once a year.
B. Every month.
C. Every ten years.
D. Only when it stops working.

21~23 BCA