A:地跨我国地势第二、三级阶梯
B:经过三个陆地自然带
C:经过三种气候类型区
D:经过我国三大经济地带
① —Who is she?
—She's my teacher,Miss Fang.
②—Who is she?
—She's my teacher,Mrs Wang.
③—Who is he?
—He's my teacher,Mr Zhang.
④—Who is he?
—He's my teacher,Mr Liu.
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