Electronic mail, or mail, as it is known to its many fans, has been around for over two decades. Typically, email systems support five basic functions, as described below. (41) refers to the process of creating messages and answers. (42) refers to moving messages from the originator to the recipient. (43) has to do with telling the originator what happened to the message. Was it rejected Was it lost (44) incoming message is needed. So people can read their email. (45) is the final step and concerns what the recipient does with the message after receiving it.

A．Composition

B．Transfer

C．Reporting

D．Displaying

以下不属于《专利法》保护范围的是（）。

A.用于娱乐的游戏机

B.用于治疗疾病的器械

C.用于医疗的麻醉品

D.疾病的诊断和治疗方法