A..html
B..style
C..json
D..css

A.span
B.a
C.dt
D.form

A.background
B.background-position
C.bcakground-image
D.background-color

A.table
B.p
C.form
D.span

A.font-size
B.line-height
C.font-family
D.font-weight

A.display：none
B.visibility：hidden；
C.overflow：none
D.overflow：hidden

A.ulli{list-style：none}
B.ulli{list-style-type：none}
C.ulli{list-style：disc}
D.ulli{list-style-type：disc}

A.盒子
B.项目
C.容器
D.属性

A.flex-start
B.flex-end
C.center
D.space-around

A.row
B.row-reverse
C.column
D.column-reverse

A.flex-direction
B.flex-order
C.justify-content
D.flex-grow