单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He sometimes considers changing majors.
B．Most people frequently change their minds.
C．He rearranged his artwork a while ago.
D．Everyone’s inside for a short time.
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单项选择题
A．Economic reason.B．Business reason.C．Political reason.D．Religious reason.
A．Economic reason.
B．Business reason.
C．Political reason.
D．Religious reason.
单项选择题
A．Aviation and Transportation Security Act was passed.B．Ensuring the safety of passengers and aircraft became a major concern at airports.C．Airport security became the responsibility of the federal government.D．Security personnel required each passenger show photo identification before entering an aircraft.
A．Aviation and Transportation Security Act was passed.
B．Ensuring the safety of passengers and aircraft became a major concern at airports.
C．Airport security became the responsibility of the federal government.
D．Security personnel required each passenger show photo identification before entering an aircraft.
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