( )，指年度国债发行额与当年财政支出的比率。
A．国债负担率
B．国债依存度
C．国债偿债率
D．国债借贷率
参考答案：B
As is known to us all, the Sahara Desert is a natural _____ between north and central Africa. [ ]
A. barrier
B. routine
C. garment
D. basis
功能凉血，解毒，养阴的药物是
A．赤芍
B．玄参
C．丹皮
D．紫草
E．大青叶
