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问题 单项选择题

下列有关强直性脊柱炎的病因的叙述，正确的是（）。

A.血清特异性自身抗体

B.与DR4基因有关联

C.与感染因素无关

D.多基因遗传，HLAB2、DR3、DR4、TNF、基因

E.寡基因致病模式，HLAB27关联性最强

答案

参考答案：E

单项选择题

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.

10（）

A.cracker

B.user

C.customer

D.client
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单项选择题

小儿易发生营养性缺铁性贫血的主要原因是（）。

A.先天储铁不足

B.铁摄入量不足

C.生长发育快

D.铁吸收障碍

E.铁丢失过多
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