单项选择题

According to the passage. The Catastraphic event happened due to ____ .

A．a shortage of electricity power
B．bombing
C．misoperation
D．a technical fault
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单项选择题
The fire caused ______ casualties.
A．two
B．thirty-four
C．thirty-sixC. forty-one
单项选择题
______ together and put out the fire.
A．Doctors, nurses and patients
B．Volunteers, policemen and firefighters
C．Firemen, policemen and reporters
D．Firemen, policemen and doctors
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