单项选择题

A．2:00 PM.
B．12:30 PM.
C．4:30 PM.
D．5:30 PM.
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单项选择题
A．Chemicals.B．Water.C．Gas.D．Vapor.
A．Chemicals.
B．Water.
C．Gas.
D．Vapor.
单项选择题
A．Secretary and boss.B．Client and lawyer.C．Student and teacher.D．Patient and nurse.
A．Secretary and boss.
B．Client and lawyer.
C．Student and teacher.
D．Patient and nurse.
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