问题
单项选择题
One solution to major security problems is (71) , which are frequently installed to fix known security holes。
A．additions
B．compensations
C．patches
D．complements
答案
参考答案：C
解析：[要点解析] 补丁是解决主要安全问题的方法，通过安装补丁可解决已知的安全漏洞。