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【单选题】
下列关于等高线的叙述是错误的是:A.
等高线经过山脊与山脊线正交；
B.
等高线必定是闭合曲线，即使本幅图没闭合，则在相邻的图幅闭合；
C.
等高线不能分叉、相交或合并；
D.
所有高程相等的点在同一等高线上
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举一反三
【简答题】A．are involved B．involved C．involve D．have involved
【单选题】( )6.So involved with their computers________that leaders at summer computer camps often have to force them to break for sports and games.
A.
became the children
B.
become the children
C.
had the children become
D.
do the children become
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