单项选择题

A．By passing steam over dry ice.
B．By turning ordinary ice into steam.
C．By heating dry ice.
D．By mixing dry ice with ordinary ice.
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单项选择题
A．To make the woman angry.B．To please the man’ s mother.C．David is the man’s good friendD．David is good at carrying on conversations.
A．To make the woman angry.
B．To please the man’ s mother.
C．David is the man’s good friend
D．David is good at carrying on conversations.
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