Which of the following will use a Cascading Style Sheet to add a font character, font size, and background image to a Web page?

以下哪项会使用级联样式表，添加一个字体性质、字体大小，和背景图片，一个网页?。

youdao

A font is a collection of character images, called glyphs, and the mappings from character codes to the glyphs.

字体是称为图符的字符图像以及从字符码到图符的映射的集合。

youdao

Most systems fall back to displaying a placeholder of some sort when an appropriate character can't be found in the current font.

当前字体中找不到某个适当的字符时，多数系统会显示一个某种占位符。

youdao

While many people may be content reading 12-point Helvetica, bibliophiles will appreciate the ability to fine-tune font weight, line-spacing and even the sharpness of each character.

WSJ: The Best E-Reader: Kobo's Aura HD