单项选择题

A．In the 1920’s.
B．In the 1930’s.
C．In the 1940’s.
D．In the 1950’s.
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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.
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.
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.
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