CSS3中,如果某个父元素仅有一个子元素,则使用()选择器不能选择这个子元素。 A: :nth-child(1) B: :last-child C: :child D: :only-child

假设该元素所在的父元素下无其他类型子元素，那么 :first-child选择器与下面( )选择器功能相同。 A: :nth-child(0) B: :nth-child(1) C: :nth-child(2) D: :nth-child(3)

在中间的div上设置10px的左右边界，以下样式正确的是（） A: listli：nth-child（1）{padding：010px；} B: listli：nth-child（2）{margin：10px0；} C: listli：nth-child（2）{margin：010px；} D: listli：nth-child（1）{padding：10px0；}

“:nth-child()”是新增伪类吗？

______, he can cook a meal. A: Child as he is B: He is a child C: Child is he D: A child he is

_____, he can write novels. A: Child as he is B: Child as is he C: As he is a child D: A child as he is

【单选题】___, he has to make a living. A.Child as he is B.A child as he is C.Child as is he C.A child as is he A. Child as he is B. A child as he is C. Child as is he D. A child as is he

______, he knows how to balance the conflicts between his parents. A: A child asheis B: Child asheis C: A child as is he D: Child as is he

According to the author, a child with ______ is an exceptional child by itself.

:nth-child(index)选择器的index值从0开始