与心肌缺血有关的因素有
A．动脉痉挛
B．动脉粥样硬化
C．梅毒
D．高安动脉炎
参考答案：A,B,C,D
---You have found your lost umbrella, haven’t you?
----Yes.I it behind the door this afternoon.
A．have found
B．will find
C．found
D．looked for
儿童是否具有假设演绎运算能力是判断他智力高低的重要标志。（）
