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D
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单项选择题
A．Arrive early for boarding.B．Carry little baggage.C．Undergo security checks.D．Go through a health check.
A．Arrive early for boarding.
B．Carry little baggage.
C．Undergo security checks.
D．Go through a health check.
单项选择题
A．Work.B．Play.C．Sleep.D．Both A and B.
A．Work.
B．Play.
C．Sleep.
D．Both A and B.
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