有“地球之肾”之称的是（    ）

一元二次方程3x²-2x-1=0的根的情况为（     ）

根据材料内容，选择正确答案。  

    There are 50 students in Class 8. Now they are doing a survey about how they spend their pocket money. Some spend it on books, and others spend it on visiting. What about you? Please read the form and answer the questions.

10%	55%	12%	10%	13%
Buy some CDs and computer games.	Buy some snacks and drinks.	Buy some books in the bookshop.	Save it up and spend it traveling on holiday.	Buy some gifts for friends.

完形填空
    Could we look back some day and say that Warren Buffett's greatest genius(天才) was finding two talented people to replace(代替)him? These two people are Ted Weschler, aged 56，and Todd Combs，aged 46，who have been chosen by Buffett as money managers to begin to1 the key investment(投资)operations of Berkshire Hathaway.
    But how did Ted and Todd catch Buffett's2? "These are the only two persons I could find, who read as 3 as I did, " Buffett says with a laugh. Actually he's not really kidding. Both Ted and Todd spend lots of time 4.
    Ted spends half a day reading many materials like5and trade periodicals(期刊). In a recent interview，Ted 6 that to become a successful investor, one needs to be hungry, curious and read all the time. Different kinds of reading will allow you to 7things that might give you an insight(洞察力)to where a business is going in five years.
    And Todd describes himself as a book with legs. He gets up at around 7 or 8 a.m. and reads 8about 7 or 8 p.m. . After dinner; he also leads for 9 hour or two in bed.
    What's the secret for financial success? It seems that 10a habit of reading really matters.

2013年元旦期间，天津市旅游部门策划推出了“听相声、看曲艺、赏民俗”等具有天津特色的文博旅游新产品，有力地活跃了假日旅游市场，全市三天共接待中外游客93. 26万人次，旅游总收入4.8亿元。由此可见(   )