Seeing the big crowd coming towards him, he started to run down the hill，but____   and went down on his hands and knees in the melting snow.

A．slipped

B．skied

C．signalled

D．sank

下列关于iPhone网络共享的说法正确的是：（）

A、iPhone不支持网络共享

B、设置〉通用〉网络〉网络共享

C、设置〉safari〉网络共享

D、iPhone的网络共享可以通过USB和蓝牙两种途径实现