单项选择题

下列选项中最适合填入问号处的是（）。

A.如上图所示
B.如上图所示
C.如上图所示
D.如上图所示

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●下列拓扑结构中，全属于广播式网络的拓扑结构的是 (65) 。①星型②网状型③环型④总线型⑤卫星通信型⑥树型(65) D.②④⑤⑥

A.①②④⑥
B.①③⑤⑥
C.③④⑤⑥

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●In the following essay, each blank has four choices.Choose the best answer and write down on the answer sheet.Communicating via Email is by far the most common Internet activity.You can (71) with anyone in the world who has an Internet address or Email (72) with a system connection to the Internet.All you need is (73) the Internet and an Email program.Two of the most widely used Email programs are Microsoft's (74) and Netscape's Navigator.A typical Email message has three basic (75) : header, message, and signaturE.(71) A.connectB.exchangeC.communicateD.game(72) A.accountB.No.C.userD.administrator(73) A.attach withB.graspC.possessD.access to(74) A.YahooB.ExplorerC.FoxmailD.Outlook Express(75) A.packetsB.elementsC.framesD.cells

A.Choose
B.
Communicating
C.You
D.All
E.Two
F.A
G.
(71)
H.connect
I.exchange
J.communicate
K.game
(72)
L.account
M.No.
N.user
O.administrator
(73)
P.attach
Q.grasp
R.possess
S.access
T.Yahoo
U.Explorer
V.Foxmail
W.Outlook
X.packets
Y.elements
Z.frames
[.cells

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