题目内容

By the time you get back, Ithe house.

A. have painted
B. will have painted

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They promised theythe project by the end of this week.

A. would have finished
B. will have finished

“@media (max-width:500px)”指定的媒体查询条件是( )。

A. 屏幕宽度大于500px
B. 屏幕宽度大于等于500px
C. 屏幕宽度小于等于500px
D. 屏幕宽度小于500px

在@media媒体查询语句中,表示“或”的逻辑操作符是( )。

A. not
B. and
C. 逗号“,”
D. only

指定设备类型仅为屏幕设备的媒体查询语句是( )。

A. @media only screen
B. @media only print
C. @media only speech
D. @media not screen