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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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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.
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