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问题 单项选择题

学习的积极主动性取决于主体对学习任务的( )。

A．认识

B．自觉需要

C．兴趣

D．自我认识

答案

参考答案：B

解析： 任何学习任务的完成均依赖于主体的学习积极性与主动性。学习的积极性取决于主体对学习任务的自觉需要。

单项选择题

关于逆转录过程的叙述，哪一项是错误的？（）

A．由反转录酶催化

B．要以RNA为模板

C．遵守碱基配对规律

D．合成的DNA称为互补DNA(cD-N

E．DNA沿3'-5'方向延长，故称反转录
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单项选择题

 Melissa and LoveLetter made use of the l:rust that exists between friends or colleagues.Imagine receiving an (1)from a friend who asks you to open it.This is what happens with Melissa and several other similar email (2).Upon running, such worms usually proceed to send themselves out to email addresses from the victim's address book, previous emails, web pages (3). As administrators seek to block dangerous email attachments through the recognition of well-known (4),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 (5)access to your network.

空白（5）处应选择（）

A.cracker

B.user

C.customer

D.client
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