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．That the man will not be able to sleep.B．That someone will enter the back door while the man is sleeping.C．That the lock on the door will break.D．That the man will not be able to come back.
A．That the man will not be able to sleep.
B．That someone will enter the back door while the man is sleeping.
C．That the lock on the door will break.
D．That the man will not be able to come back.
单项选择题
A．By turning ordinary ice into steam.B．By passing steam over dry ice.C．By heating dry ice.D．By mixing dry ice with ordinary ice.
A．By turning ordinary ice into steam.
B．By passing steam over dry ice.
C．By heating dry ice.
D．By mixing dry ice with ordinary ice.
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