从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性。（） A． B

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.

（6）是（）

A.attachment

B.packet

C.datagram

D.message

进口应税消费品，按照组成计税价格和规定的税率计算缴纳消费税税额，其组成计税价格的公式是( )。

A．组成计税价格=(关税完税价格+关税)/(1-消费税税率)

B．组成计税价格=(关税完税价格+关税)/(1+消费税税率)

C．组成计税价格=关税完税价格+关锐

D．组成计税价格=关税完税价格+关税+增值税

某一患者的右上第一恒磨牙因隐裂，经牙髓治疗后’，将行冠修复，在形成冠面形态时，第一恒磨牙面的斜嵴是连接哪两个牙尖（）

A.近中颊尖与远中颊尖

B.近中颊尖与近中舌尖

C.近中颊尖与远中舌尖

D.近中舌尖与远中颊尖

E.以上都不是

风力在（ ）级以上时，不得进行塔机顶升作业。

A．4

B．5

C．6

D．7

企业所得税的应纳税所得额为（）。

A.企业每一纳税年度的收入总额，减除不征税收入、免税收入、各项扣除以及允许弥补的以前年度亏损后的余额，为应纳税所得额

B.企业每一纳税年度的收入总额，减除免税收入、各项扣除以及允许弥补的以前年度亏损后的余额，为应纳税所得额

C.企业每一纳税年度的收入总额，减除不征税收入、各项扣除以及允许弥补的以前年度亏损后的余额，为应纳税所得额

D.企业每一纳税年度的收入总额，减除不征税收入、免税收入、各项扣除的余额，为应纳税所得额