（）不仅会使电气设备进一步损坏，形成短路事故，而且还可能导致人身触电和瓦斯、煤尘爆炸危险。
A、过流
B、短路
C、漏电
参考答案：C
—What were you doing when she dropped in?
—I for a while and_________ some reading.
A．was playing; was going to do
B．played; did
C．had played; was going to do
D．had played; did
在验光时，以避免调节因素对屈光造成的影响，对7岁以下的斜视弱视患者可用（）阿托品药膏涂眼散瞳
