单项选择题

A．It takes a longer time to melt.
B．It is lighter than ordinary ice.
C．It is cleaner to use than ordinary ice.
D．It is not so cold as ordinary ice.
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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 melting 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 melting dry ice.
D．By mixing dry ice with ordinary ice.
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.
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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