单项选择题

A．Because they all work very hard.
B．Because their teachers are all native speakers of English.
C．Because they learn not only in but also out of class.
D．Because they are all advanced students.
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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.
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.
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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