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问题 单项选择题

班集体形成的条件和前进的动力是（）。

A.共同的奋斗目标

B.班主任的要求

C.班级内部的矛盾斗争

D.共同的活动

答案

参考答案：A

解析：共同的奋斗目标是班集体形成的条件和前进的动力。

单项选择题

合成血红素的原料有（）

A.苏氨酸，甘氨酸，天冬氨酸

B.甘氨酸，琥珀酰CoA，Fe+

C.甘氨酸，辅酶A，Fe+

D.甘氨酸，天冬氨酸，Fe+

E.丝氨酸，乙酰CoA，Ca+
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单项选择题

Melissa and Love Letter made use of the trust that exists between friends or colleagues. Imagine receiving an (26) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (27) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (28) .
As administrators seek to block dangerous email attachments through the recognition of well-known (29) , 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 (30) access to your network.

A．virtual

B．virus

C．worms

D．bacteria
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