食物过敏症发病机制为（）.
A.Ⅰ型超敏反应
B.Ⅱ型超敏反应
C.Ⅲ型超敏反应
D.Ⅳ型超敏反应
E.Ⅰ型和Ⅳ型超敏反应
参考答案：A
Have you seen Mary lately? My boss wants to know__________.
A．how she is getting along
B．how is she getting along
C．what she is getting along
D．what is she getting along
预备热处理安排在加工工序后进行，以改善切削性能，消除加工过程中的内应力。( )
