57 What is the main idea of the passage?
(A) Fire is a both a great invention and a source of danger.
(B) The number of deaths caused by fire has greatly reduced in the past 30 years.
(C) It is important that we take measures to ensure fire safety in buildings.
(D) Fire evacuation can help ensure the safety of building occupants.
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統計: A(23), B(11), C(48), D(9), E(0) #3116999
統計: A(23), B(11), C(48), D(9), E(0) #3116999