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问题 单项选择题

已知一个地区某年未满周岁的婴儿死亡数和该年的活产数，则能计算（）

A.婴儿死亡率

B.1岁以下人口死亡率

C.0～1岁人口死亡率

D.新生儿死亡率

E.粗死亡率

答案

参考答案：A

判断题

尚处在海关监管期限内的特定减免税货物，未经海关同意，不能擅自销售和转让。
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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．names

B．cookies

C．software

D．extensions
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