单项选择题

A．4 years
B．5 years
C．8 years
D．at least 9 years
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单项选择题
A．California.B．Southern Alaska.C．The arctic.D．Europe.
A．California.
B．Southern Alaska.
C．The arctic.
D．Europe.
单项选择题
A．From three to five months.B．Three months.C．Five months.D．Four months.
A．From three to five months.
B．Three months.
C．Five months.
D．Four months.
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