依那普利的降压作用机理：
A．阻断AT1受体B．阻断α1受体C．阻断β受体D．激动α2受体E．抑制血管紧张素转换酶
参考答案：E
用一个半径为30cm，圆心角为60°的扇形纸片围成一个圆锥形纸帽，则纸帽的底面圆半径为__________cm．
I feel it is you rather than the boy who________ for being late for the speech.[ ]
A. is to blame
B. are to blame
C. is to be blamed
D. are to be blamed
