单项选择题

A．A lot of food.
B．A basketball.
C．A plenty of drink.
D．Some toy cars.
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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.
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.
填空题
leaving
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