单项选择题
A.干沟 B.山脚崖坎脚下 B.山顶上 D.交叉河口
A.1/3 B.1 C.1/5 D.1/2
A.1 B.1/10 C.1/2 D.1/5
A.0.1% B.0.2% C.0.3% D.0.4%
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