南京理工大学2012年学校共有各类在籍生（）万余人。
A.1
B.2
C.3
D.4
参考答案：C
收入10元用+10元表示，那么﹣20元表示（ ）.
There was such a long queue for coffee at the interval that we _______ gave up.
A．eventually
B．unfortunately
C．generously
D．purposefully
