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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.A. cracker
B. user
C. customer
D. client

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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.A. attachment
B. packet
C. datagram
D. message

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[单项选择]The men who first made use of meteoritic metal were ______.

A. small isolated tribes
B. those who did not revere meteorites
C. nineteenth century scientists
D. warriors

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[单项选择]The way of communication ______ made use of were visible signs.

A. French
B. Roman
C. African
D. American

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[单项选择]Every minute must be made full use of （　） our lessons, for the college entrance exam is coming.
A. going over
B. to go over
C. go over
D. our going over

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[单项选择]The program is made up of two trust funds（）could run out by next year.
A. the large one
B. the largest of which
C. the largest one
D. the larger of which

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[单项选择]Every minute must be made full use of ______ our lessons, for the college entrance exam is coming.
A. going over
B. to go over
C. go over
D. our going over

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[单项选择]Every minute must be made full use ______ at the preparations for the exams.
A. of to work
B. of work
C. of working
D. to working

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[单项选择]The program is made up of two trust funds ______ could run out by next year.
A. the large one
B. the largest of which
C. the largest one
D. the larger of which

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[单项选择]Why did the men who made maps have to use their imagination

A. Each man wanted to have a different map.
B. They did not like to draw the world as it really was.
C. No one knew what the world was really like.
D. They did not remember what they had seen.

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[单项选择]It is no use arguing with him because he has made up his mind to go there.
A. settled
B. solved
C. talked
D. decided

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