以下风险中，属于系统风险的是()。
A.信用风险
B.市场风险
C.操作风险
D.流动性风险
参考答案：B
—What are these?
—They are .
A．pencils B．books C．pens
The little boy was continually ________the ornaments.
A．tripping up
B．falling down
C．breaking up
D．knocking over
