He found himself       by a crowd of excited people and       to escape.

A．surrounded; trying

B．surrounding; trying

C．surrounding; tried

D．surrounded; tried

具有多媒体功能的微型计算机系统中，常用的CD-ROM是（）

A．只读性光盘

B．半导体只读存储器

C．只读性硬盘

D．只读性大容量软盘