多年冻土，分为两层:上部是（）的活动层；下部是（）的多年冻结层。
参考答案：夏融冬冻；终年不融
若m+n=3，则2m2+4mn+2n2-6的值为（ ）
A．12
B．6
C．3
D．0
The __ girl likes to ask too much about ___ privacy.
A．twentyo years-old… others’
B．twenty-year-old…other’s
C．twenty-year-old..some else’s
D．twenty-year old..other’s
