单项选择题

主机和外部设备共同组成计算机系统，以下
Ⅰ．CPU
Ⅱ．内存储器
Ⅲ．光存储器
Ⅳ．打印机
( )共同构成计算机系统的主机。
A．Ⅰ和Ⅱ
B．Ⅰ、Ⅱ和Ⅲ
C．Ⅰ、Ⅱ，和Ⅳ
D．Ⅰ、Ⅱ、Ⅲ和Ⅳ

A.CPU
Ⅱ．内存储器
Ⅲ．光存储器
Ⅳ．打印机
B.Ⅰ和Ⅱ
B．Ⅰ、Ⅱ和Ⅲ
C．Ⅰ、Ⅱ，和Ⅳ
D．Ⅰ、Ⅱ、Ⅲ和Ⅳ

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单项选择题

听力原文： Alright everyone, we are nearing the end of our tour. If you look to your left you will see that the building on the East side is a little different than the other buildings. It is the Eddleson building. It was designed by the famed architect Elliot Eddleson. This building, although being designed and constructed at the same time as the other buildings around his is noticeably modern in appearance. This has been attributed to Mr. Eddleson's unique appreciation of this particular aesthetic. The uniqueness of the design made for a difficult construction and due to the unusual cold weather at the time construction had to be delayed for 3 months. Our last stop in the tour will be inside the main foyer of Mr. Eddleson's masterpiece.
Who most likely is the speaker?
A．A famed architect
B．A tour guide
C．Construction worker
D．Department manager

A.
Who
B.A
C.A
D.Construction
E.Department