单项选择题

A．To attract more students.
B．To make the courses suitable for students of all levels.
C．To let the students have a good rest.
D．To help everyone to make new friends, have fun and improve their English.
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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．Chemicals.B．Vapour.C．Water.D．Gas.
A．Chemicals.
B．Vapour.
C．Water.
D．Gas.
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