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A．To commemorate a historic flight,
B．To try out eight new balloons.
C．To recruit balloonists from all over the United States.
D．To test whether helium (氦气) balloons are better than hot-air balloons.
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单项选择题
A．A comparison between conscious and unconscious behavior patterns.B．Recent developments in psychology research.C．Reasons for certain behavior patterns.D．Reasons for being late.
A．A comparison between conscious and unconscious behavior patterns.
B．Recent developments in psychology research.
C．Reasons for certain behavior patterns.
D．Reasons for being late.
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