下表是某研究性学习小组调查土壤中螨类孳生与某化工厂重金属铬污染的相关性结果。根据表中信息，判断下列叙述正确的是

A．污染区内螨类密度显著提高

B．实验采用取样器采集土样计算螨类数量

C．螨类可作为土壤铬污染的指示生物

D．螨类物种丰富度与铬污染相关

Originally introduced by Netscape Communications, （） are a general mechanism which HTTP Server side applications, such as CGI （） , can use to both store and retrieve information on the HTTP （） side of the connection. Basically, Cookies can be used to compensate for the （） nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based （） .

（）are a general mechanism which HTTP Server side applications.

A．Browsers

B．Cookies

C．Connections

D．Scripts