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问题 选择题

在图中的两幅海水等温线图中，虚线表示洋流，下列叙述中不正确的是(　　)

A．①是暖流，位于北半球

B．②是暖流，位于南半球

C．①②均向北流动

D．①位于大陆东岸，②位于大陆西岸

答案

答案：B

本题考查洋流。根据等温线的分布：①处越往北温度越低，判断为北半球，洋流从水温高处流向水温低处，故为暖流；②处越往北温度越高，判断为南半球，洋流从水温低处流向水温高处，为寒流，故B项错误。

选择题

“地形以高原、山地为主，平均海拔高；地面起伏大，高低悬殊；地势中部高，四周低。”以上是对某大洲地形特征的描述，据此回答下题。

小题1:该大洲是(    )

A．欧洲

B．非洲

C．亚洲

D．南美洲小题2:关于该大洲的世界之最，下列说法正确的是:①有世界上面积最大的季风气候区②有世界上面积最大的平原③有世界上最长的河流④有世界上海拔最高的山脉(    )

A．①②

B．③④

C．①④

D．②③
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单项选择题

Melissa and Love Letter 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.

（71）处填（）。

A．attachment

B．packet

C．datagram

D．message
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