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问题 选择题

某地以东是东半球、以西是西半球、以北是北半球、以南是南半球，则该地的经纬度是(  )

A．00180o

B．0020oW

C．0000

D．0020oE

答案

答案：B

本题考查半球的划分。东西半球的分界线是20°W和160°E构成的经线圈，东半球的范围是：20°W向东到160°E。南北半球的分界线是赤道，0°纬线。所以本题选择B选项。

单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (71) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (72) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (73) .
As administrators seek to block dangerous email attachments through the recognition of well-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 will still run and 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, simultaneously runs commands in the background to steal your passwords and give the (75) access to your network.

A．cracker

B．user

C．customer

D．client
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