请根据你所学习的光学知识，判断下列观点中正确的是（　　）

A．所有光学元件都是利用光的折射来成像的

B．在生活实际中镜面反射比漫反射更为常见

C．小孔成像是由于光沿直线传播而形成

D．平面镜所成像的大小与物体到镜面的距离有关

Multipurpose Internet Mail Extension (MIME) is a (76) document messaging standard in the Internet environment. With MIME, users can send (77) E-mail messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be (78) into messages. It defines the fonts, formats, and (79) features of a document so the document can be easily (80) on many different types of systems.

A．incorporated

B．filled

C．stored

D．filed