某班第一组12名同学在“爱心捐款”活动中,捐款情况统计如下表,则捐款数组成的一组数据中,中位数与众数分别是( )
捐款(元)
10
15
20
50
人数
1
5
4
2
A:15,15
B:17.5,15
C:20,20
D:15,20
It is not easy to cross the river a ropeway.
Whose pen is it? It____ Peter's. His name is on the cover.