单项选择题
Water can put out common fires, such as ().
A.wood,paper
B.textile
C.A+B
D.oil
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For the duties ()in one emergency, one person may do more than one job and one job may be done by more than one person.
A.assigning
B.assign
C.toassign
D.assigned -
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Seven short blasts continued for one minute means ().
A. fire alarm
B. boat alarm
C. man overboard
D. emergency alarm -
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Several sand boxes need ().
A. to repair and renew
B. repairing and renewing
C. repair and renew
D. repaired and renewed
