单项选择题

To specify the drawing area of the background to the content box, which attribute value of the background-clip attribute should be used?（)

A．content-box
B．border-box
C．padding-box
D．none-box
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判断题
Cooked silk is slightly hard in texture, translucent and it feels smooth in the hand. It has excellent strength and elasticity.
单项选择题
“下冰棱”、“流冰”都是哪种天气现象的别称？
A.冰雹
B.冻雨
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