Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.

A．had left

B．would leave

C．was leaving

D．has left

一群孩子食用路边的烤串，半个小时后，家长突然发现孩子的情况不对。原本活蹦乱跳的扬扬突然脸色发紫，气息加快，难受得直冒冷汗。不一会儿，还呕吐出了一大堆食物残渣，并且意识逐渐模糊。周遭路人说是"乌嘴病"，家长焦急万分，赶紧拦下一辆出租车，送孩子前往医院抢救。

该物质中毒剂量为（）

A.0.2～0.5g

B.0.5～0.8g

C.0.8～1.0g

D.1.0～3.0g

E.3g