利率
参考答案：
又称利息率，是指利息占借贷资本的比率。
There are many cars coming up and down. If you insist on standing there, you will risk _________ down on the ground.
A．knocking
B．to knock
C．being knocked
D．knocked
下列可激活PKA的物质是（）
A.ATP
B.CAMP
C.ADP
D.CGMf
E.GMP
