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问题 选择题

已知正比例函数y= (2t-1) x的图象上一点(x1, y1)且x1 y1<0，x1 +y1>0那么t的取值范围是[ ]

A.t<0.5

B.t>0.5

C.t<0.5或 t>0.5

D.不确定

答案

答案：A

多项选择题

与督脉交会经脉是（）。

A.足少阴

B.足少阳

C.足太阳

D.足太阴

E.任脉
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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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