单选题Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.A insulate your shoesB ground the fire hoseC secure its power supplyD start the fire pump

The forest fire caused by the volcano is difficult to be______.

A. put off

B. put on

C. put out

D. put up

Part IV Cloze (20 points) Directions: There are ten blanks in the following passages. And there are five choices marked A), B), C), D) and E). Match each blank with the right choice. Passage One Fire can help people in many ways. Fire can heat water, (41) () your house, give light and cook food. But fire can burn things too. Nobody knows (42) () people began to use fire. One story from Australia tells about a man a very long time ago. He went up to the sun by a rope and brought fire down. Today people know how to (43) () a fire with matches. Children sometimes like to play with them. But matches can be very dangerous. Fire kills people every year. So you must be careful about matches. You should also learn to (44) () fires. Fires need oxygen. Without oxygen they die. There is oxygen in the air. Cover a fire with water, sand, or in an emergency, with your coat or a blanket. This keeps the air (45) () a fire and kills it. Be careful with fire, and it will help you. Be careless with fire, and it might hurt you.

(1). A.make B.warm C.how D.put out E.from

(2). A.make B.warm C.how D.put out E.from

(3). A.make B.warm C.how D.put out E.from

(4). A.make B.warm C.how D.put out E.from

(5). A.make B.warm C.how D.put out E.from

A.broke out

B.put out

C.set out

D.found out

A fire involving trash and paper waste would be classified as a ______.

A.class A

B.class B

C.class C

D.class D

A.prevent

B.put off

C.put out

D.light

The class of fire on which a blanketing effect is essential to extinguish the fire is

A.Class 'A'

B.Class 'B'

C.Class 'C'

D.Class 'D'

A. put off

B. put on

C. put out

D. put with