药材牛黄的药用部位是（）
A.胆结石
B.背甲及腹甲
C.未骨化的密生茸毛的幼角
D.鳞甲
E.干燥分泌物
参考答案：A
Confronted with the complex international situation, we need a foreign policy that is more ____.
A．symbolic
B．confidential
C．controversial
D．flexible
“合同协议号”栏应填（）。
A．SHL080827
B．FY030502
C．8GUF290
D．C33021345228
