写出一个一根为零，并且二次项系数为1的一元二次方程______．

2011年5月2日新华网重庆讯：为了让母亲尽快动手术，女儿欢欢毅然来到国美电器杨家坪盾安旗舰店将自己去年10月买的准备结婚用的嫁妆——一台奥克斯冰柜、一台容声冰箱、两台空调挂机退掉。当记者采访时，她说：“妈妈养育我，做这些事不算啥，是应该的！我会尽全力为妈妈治病。”可母亲却说：“欢欢在一家物业公司上班，每月的收入只有1000多元，我最不想的事就是拖累她。”

读了上述材料后，上行中学八（3）班准备以此材料为载体，开展系列实践活动。请你参与进来，共同完成！

（1）主题展示：请你为本次实践活动确定一个恰当的主题。

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（2）专栏设计：在本次活动中，该班创办了一期专栏，并在专栏中设置了“让母女情在身边延伸”板块。假如要你完善本板块的内容，你会写下哪些内容？

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（3）畅谈感想：通过参加本次实践活动，你有哪些感想？

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依次填入下面横线处的词语，恰当的一组是[ ]

①人类发明了种种工具挖掘出大自然亿万年积累下来的宝藏，谁能________那些斑驳的矿坑不会是人类自掘的陷阱呢？ ②我________地接过他的本子，看着那密密麻麻的数字，内心深表怀疑。 ③这里的水却是镜子一样平，蓝天一般清，拉长的水草在水底轻轻地________。

A．断言 迟疑 浮动

B．预言 怀疑 漂动

C．断言 怀疑 漂动

D．预言 迟疑 浮动

诊断和改正程序中错误的工作通常称为【 】。

阅读理解。

     阅读下面的短文。请根据短文后的要求答题(请注意问题后的字数要求)。

1)  One in four people spend more time socializing online, using sites such as Facebook, than they

do in person, according to research.

2)  People now have 11 different ways of staying in contact with their friends from the comfort of

their sofa or bedroom.

3)  These include simple email, messenger, text and several forms of social networking from Twitter

to Facebook, said the survey by online casino Yazino.

4)  It is found even when there is time to see people face to face, like at a weekend, up to 11 percent

of all adults still choose to       .

5) This could be down to laziness, the cost of going out or simply not wanting too much personal

contact with friends and family but just enough to swap brief messages and online chats.

6) It all adds up. The average online Brit spends 4.6 hours a week talking to friends online and only

six hours a week talking to people in person, said Yazino.

7) There is even an army of "extreme sofalisers"－the three percent who spend a staggering 25 hours

or more each week talking to friends via electronic devices.

8) The survey of 2, 000 adults also found 11 percent organize all their social diary around Facebook,

Bebo or other network sites.

9) Yazino founder Hussein Chahine said, "Communication is constantly evolving. Some people are as

used to seeing their friends' online image as they are their face."

10) "We are now just as likely to SMS or email a friend as we are to call them."

11) "People increasingly prefer quick and frequent engagement with instant updates on news than a

prolonged chat and are also finding new ways to catch up with friends from their comfort of their sofa."

12) More than seven in ten text their friends and family and 31 percent use social networking sites

while just 27 percent now use email as their primary means of contact.

13) A further 18 percent use live chat and instant messaging systems.

1. What is the title of the passage? (no more than 10 words)

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2. Complete the following statement with proper words. (no more than 4 words)

   Some people see their friends' online image so often that they feel as if                .

3. Please fill in the blank in the fourth paragraph with proper words or phrases to complete the

sentence. (no more than 8 words)

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4. List two reasons why many people don't want to talk to people in person. (no more than 15 words)

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5. What does the underlined word "These" (Line 1, Paragraph 3) probably refer to? (no more

than 10 words)

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轮胎组成各部件的名称及功能？