如图,PAB、PCD为⊙O的两条割线,若PA=5,AB=7,CD=11,AC=2,则BD等于____
Your ____ (foot) are too big.
如图,吸收大部分营养物质的器官是( )
In April, the weather in some places in Shanxi was really changeable. People still remember they have _______ four seasons in a week.