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问题 选择题

下列哪幅图正确的反映了我国的地势特征（　　）

A．

B．

C．

D．

答案

中国地势西高东低，呈三级阶梯分布．观察四幅图，最能反映中国地势特点的是选项C，故符合题意；选项A、B、D不符合题意．

故选：C．

填空题

主视图反映物体的______和______，俯视图反映物体的______和______，左视图反映物体的______和______．因此，必须注意主视图与俯视图的长对正，主视图与______的高平齐，左视图与______的宽相等．
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单项选择题

Melissa and LoveLetter made use of the trust that exists between friends orcolleagues．Imagine receiving an (71) from a friend who asks you to open it．This is whathappens with Melissa and several other similar email (72) ．Upon running，such wormsusually proceed to send themselves out to email addresses from the victim’s address book，previous emails，web pages (73) ．

A．names B．cookies C．software D．extensions

As administrators seek to block dangerous email attachments through the recognition ofwell—known (74) ，virus writers use other extensions to circumvent such protection．Executable(.exe)files are renamed to．bat and．cmd plus a whole list of other extensions and wilt still runand successfully infect target users．
Frequently，hackers try to penetrate networks by sending an attachment that
looks like a flash movie，which，while displaying some cute animation，simultaneouslyruns commands in the background to steal your passwords and give the (75) access to yournetwork．
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