单项选择题

A．By turning ordinary ice into steam.
B．By passing steam over dry ice.
C．By heating dry ice.
D．By mixing dry ice with ordinary ice.
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单项选择题
A．One.B．Few.C．Several.D．Many.
A．One.
B．Few.
C．Several.
D．Many.
单项选择题
A．Impatient but then reluctant.B．Indifferent but then interested.C．Reluctant but then convinced.D．Impatient but then accepted.
A．Impatient but then reluctant.
B．Indifferent but then interested.
C．Reluctant but then convinced.
D．Impatient but then accepted.
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