管印人不得经管有制约关系的重要空白凭证及有价单证，以确保（）分管分用。
A.据
B.印
C.押
D.证
参考答案：B, D
_________, the more expensive the camera, the better its quality.
A．General speaking
B．Speaking general
C．Generally speaking
D．Speaking generally
“信天游”是（）地区民歌。
A.西南
B.西北
C.东北
D.东南
