按地形图比例尺分类，1:10000地形图属于( )比例尺地形图。
A．大 B．较大C．中 D．小
参考答案：A
The children were warned of not being too __________ about things they are not supposed to know.
A．strange
B．amusing
C．curious
D．satisfied
对含有n个互不相同元素的集合，同时找最大元和最小元至少需要（）次比较。
A．2n
B．2(n-1)
C．n-1
D．n+1
