代谢产物均无活性的药物是（）
A.地高辛
B.苯妥英钠
C.环孢素
D.阿米卡星
E.阿米替林
参考答案：B
构图必须达到视觉平衡，这是构图首先要注意的问题。
The less the surface of the ground yields to the weight of the body of a runner, ________ to the body.
A．the stress it is greater
B．greater is the stress
C．greater stress is
D．the greater the stress
