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问题 单项选择题

纳税人生产销售下列轮胎（非子午线轮胎）不缴纳消费税的是（）。

A．翻新轮胎

B．公共汽车轮胎

C．摩托车轮胎

D．汽车与农用拖拉机通用轮胎

答案

参考答案：A

解析：

自2001年1月1日起，对"汽车轮胎"税目中的子午线轮胎免征消费税，对翻新轮胎停止征收消费税。

单项选择题

系统管理员的密码要求包括（）。

A.由数字、大小写字母和特殊字符随机组成

B.长度不小于12位

C.长度不小于8位

D.更改密码的周期一般不超过3个月

E.一般不修改密码
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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 (16) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (17) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (18) .
As administrators seek to block dangerous email attachments through the recognition of well-known (19) , 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 (20) access to your network.

A．names

B．cookies

C．software

D．extensions
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