— The box is too heavy to carry. What's in it?
— Jack _______ it with many books.
A:filled
B:covered
C:used
D:asked
如图,AB是⊙O的直径,C是⊙O上一点,AD垂直于过点C的直线,垂足为D,且AC平分∠BAD.(1)求证:CD是⊙O的切线;(2)若AC=26,AD=4,求AB的长.
有人将1928年爆发的资本主义经济危机比作一只笼罩全球的巨大章鱼(见下图)。下列选项与这场经济危机无关的是( )