题目：
Originally introduced by Netscape Communications, (21) are a general mechanism which HTTP Server side applications, such as CGI (22) , can use to both store and retrieve information on the HTTP (23) side of the connection. Basically, Cookies can be used to compensate for the (24) nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (25) .
21（）
A.Browsers
B.Cookies
C.Connections
D.Scripts
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D解析：本题考查的是考生分析简单循环结构的能力。大体过程为第1次进入循环，i 变成7，num变为1，i变为6；第2次进入循环，i变成5，num变为2，i变为4；第3次进入 循环，i变成3，num变为3，i变为2；第4...
