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问题 单项选择题

下列哪种说法是正确的（）

A.信息整理的方法主要是根据信息提取频率和数量，建立一套适合需要的信息库系统

B.从网上下载资料包括下载邮件地址这一方法

C.信息加工的目的在于提高信息的价值和提取效率

D.在浏览和分类过程中，对大量的信息有一个初步筛选的任务。完全没有用的信息应当及时将它们删去。但应当注意，有些信息，单独看起来是没有用的，但积累起来就有了价值

答案

参考答案：D

单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (6) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (7) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (8) .

As administrators seek to block dangerous email attachments through the recognition of well-known (9) , 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 (10) access to your network.

（8）是（）

A.memory

B.caches

C.ports

D.registers
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选择题

为了验证温度对种子萌发的影响，设计了如图的实验装置，请选出正确的实验组和对照组（　　）

A．①和③

B．①和②

C．②和③

D．②和④
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