Jane is one of the students in the class         have ever been to China.

A．who

B．whose

C．which

D．whom

踩踏事件发生后，正确的做法是（）。

A.尽量跟着人群跑

B.抱成团蹲在地上

C.快速呼救、大喊

D.保持镇静，寻找避难处