如图，□ABCD的周长是28 cm，△ABC的周长是22 cm，则AC的长为（   ）

在指定环境中，下列各组离子一定可以大量共存的是（   ）

如图为泰州政区示意图，关于泰州，下列说法正确的是（    ）

某产品生产厂家根据以往的生产销售经验得到下面有关生产销售的统计规律：每生产产品x（百台），其总成本为G（x）（万元），其中固定成本为2.8万元，并且每生产1百台的生产成本为1万元（总成本=固定成本+生产成本）．销售收入R（x）（万元）满足 $R\left(x\right)=\{\begin{array}{c}-0.4x^2+4.2x\left(0\le x\le 5\right)\\ 11\left(x＞5\right)\end{array}$ ，假定该产品产销平衡（即生产的产品都能卖掉），根据上述统计规律，请完成下列问题：

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    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.