常见的可引起牙龈增生的药物是
A．苯妥英钠B．心痛定C．环孢素D．维拉帕米E．以上全是
参考答案：E
投资基金的收益免税吗？
Unfortunately, the computer system ______ suddenly while they were searching for some
information on the Internet.[ ]
A. broke up
B. broke down
C. broke away
D. broke out
