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[主观题]
The main idea of the final paragraph is that ______.A．in an emergency all the technical al
The main idea of the final paragraph is that ______.
A．in an emergency all the technical alternations should be studied
B．expert should be specially trained to determine the exact difference between detergent and chalk
C．we ought to decide what measures to take before a disaster occurs
D．technical experts should be examined and tested to see whether they are capable of selecting the right course of action in a future emergency
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