患者，女，39岁。痈疽溃后，腐肉不去，新肉难生。首选的药物是（）
A.铅丹
B.升药
C.炉甘石
D.大蒜
E.蟾酥
参考答案：B
He had his camera ready ________ he saw something that would make a good picture.
A．even if
B．soon after
C．in case
D．so that
下列哪个选项属于条件反射( )
A．眨眼反射
B．吸吮反射
C．防御反射
D．信号反射
