单选题The primary method by which water spray puts out fires is by（）.A removing the oxygenB cooling the fire below the ignition temperatureC removing combustible materialD diluting combustible vapors

One advantage of the all-purpose nozzle is that it ______.

A.can fit any size hose

B.converts a stream of water into a fog

C.increases the amount of water reaching the fire

D.can spray two streams of water at the same time

The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to ______.

A.a difference in water pressure

B.the method of breaking up the water stream

C.the length of the applicator

D.All of the above

Which of the following is true?

A.The water in Texas have been reduced by 75%.

B.Most industries in the world suffer from water shortagers.

C.The underground water in Saudi Arabia might run out in 50 years.

D.Good management of water use resulted from the project in the Central Valley.

The BEST method of applying foam to a fire is to ______.

A.spray directly on the base of the fire

B.flow the foam down a nearby vertical surface

C.sweep the fire with the foam

D.spray directly on the surface of the fire

After being launched from a vessel, totally enclosed survival craft which have been afloat over a long period require ______.

A.frequent opening of hatches to permit entry of fresh air

B.regular checks of bilge levels

C.use of ear plugs to dampen engine noise

D.frequent flushing of the water spray system with fresh water

29． Which one is wrong?

A． Mike always puts his things away．

B． Tom can mend the kite．

C．Mike is not a careful boy．

D． Mike's shoes are worn out