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.
填空题
Except whom of all mammals do they swim naturally from birth
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