单项选择题

没有鱼鳔的鲨鱼依靠哪个器官获得浮力？

A.腹鳍
B.肝脏
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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
判断题
Cooked silk is slightly hard in texture, translucent and it feels smooth in the hand. It has excellent strength and elasticity.
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