单项选择题

A. People may behave strangely under stress.
B. Criminals are in disguise and behaved as security guards.
C. Security officers can easily identify the criminal acts.
D. Passengers usually behave differently in the airport.
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单项选择题
A. Lower prices. B. More choices.C. More competition. D. More companies.
A. Lower prices.
B. More choices.
C. More competition.
D. More companies.
单项选择题
A. Go to the parties. B. Go for a ride with the man. C. Study for her exam. D. Change her clothes.
A. Go to the parties. B. Go for a ride with the man.
C. Study for her exam. D. Change her clothes.
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