单项选择题

A．A flood wall was built.
B．Rescue teams were formed.
C．An alarm system was set up.
D．50 underground stations were made waterproof.
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单项选择题
The so-called fight-or-flight response (Para. 1) refers to ________ .
A．the biological process in which human beings’’ sense of self-defense evolves
B．the instinctive fear human beings feel when faced with potential danger
C．the act of evaluating a dangerous situation and making a quick decision
D．the elaborate mechanism in the human brain for retrieving information
单项选择题
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
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