可抑制心肌收缩力的药物是（）
A.五味子
B.石榴皮
C.乌梅
D.山茱萸
E.肉豆蔻
参考答案：A
—________ does Lucy go to school every day?
—She walks to the bus stop, then takes the bus.
A．How far
B．How long
C．How often
D．How
辐射雾主要发生在地面至（）米的浅层内
A.100-200
B.200-300
C.100-400
D.200-400
