若对于任意实数x，不等式|x|≥ax恒成立，则实数a的取值范围是______．

已知a+b+c=-3，且，则(a+1)2+(b+2)2+(c+3)2=______．

Leadership is hardly a new area of research

A.条件(1)充分，但条件(2)不充分．B.条件(2)充分，但条件(1)不充分．C.条件(1)和条件(2)单独都不充分，但条件(1)和条件(2)联合起来充分．D.条件(1)充分

设东、南、西、北四面通向山顶的路分别有k，l，m，n(0＜k＜l＜m＜n)条，要使从某一面上山

设a，b，c是△ABC的三边长，二次函数在x=1时取最小值，则△ABC是______．

A.条件(1)充分，但条件(2)不充分B.条件(2)充分，但条件(1)不充分C.条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分D.条件(1)充分

若，则=______。

有一种细菌，经过1分钟，分裂成2个，再过1分钟，变成4个，这样把一个细菌放在瓶子里到充满为止

When we worry about who might be spying on our private lives, we usually think about the Federal agents. But the private sector outdoes the government every time. It's Linda Tripp, not the FBI, who is facing charges under Maryland's laws against secret telephone taping. It's our banks, not the Internal Revenue Service (IRS), that pass our private financial data to telemarketing firms. Consumer activists are pressing Congress for better privacy laws without much result so far. The legislators lean toward letting business people track our financial habits virtually at will. As an example of what's going on, consider U. S. Bancorp, which was recently sued for deceptive practices by the state of Minnesota. According to the lawsuit, the bank supplied a telemarketer called MemberWorks with sensitive customer data such as names, phone numbers, bank account and credit-card numbers, Social Security numbers, account balances and credit limits. With these customer lists in hand, MemberWorks started dialing for dollars—selling dental plans, video games, computer software and other products and services. Customers who accepted a "free trial offer" had, 30 days to cancel. If the deadline passed, they were charged automatically through their bank or credit-card accounts. U.S. Bancorp collected a share of the revenues. Customers were doubly deceived, the lawsuit claims. They didn't know that the bank was giving account numbers to MemberWorks. And if customers asked, they were led to think the answer was no. The state sued MemberWorks separately for deceptive selling. The company denies that it did anything wrong. For its part, U.S. Bancorp settled without admitting any mistakes. But it agreed to stop exposing its customers to nonfinancial products sold by outside firms. A few top banks decided to do the same. Many other banks will still do business with MemberWorks and similar firms. And banks will still be mining data from your account in order to sell you financial products, including things of little value, such as credit insurance and credit-card protection plans. You have almost no protection from businesses that use your personal accounts for profit. For example, no federal law shields "transaction and experience" information—mainly the details of your bank and credit-card accounts. Social Security numbers are for sale by private firms. They've generally agreed not to sell to the public. But to businesses, the numbers are an open book. Self-regulation doesn't work. A firm might publish a privacy-protection policy, but who enforces it? Take U. S. Bancorp again. Customers were told, in writing, that "all personal information you supply to us will be considered confidential." Then it sold your data to MemberWorks. The bank even claims that it doesn't "sell" your data at all. It merely "shares" it and reaps a profit. Now you know. Contrary to popular belief, the author finds that spying on people's privacy ______.

A.条件(1)充分，但条件(2)不充分．B.条件(2)充分，但条件(1)不充分．C.条件(1)和(2)单独都不充分，但条件(1)和(2)联合起来充分．D.条件(1)充分

a、b、c均为不等于零的实数，若且+n2+9=6n

从甲地到乙地，水路比公路近40公里．上午10时，一艘轮船从甲地驶往乙地，下午1时

某商店将每套服装按原价提高50%后再做7折优惠的广告宣传

曲线x2-2x+y2-3=0到直线3x+4y+5=0的最长距离是______。 A． B．4 C．5 D． E．6

设f(x)是x的多项式，f(x)除以3(x-1)和2(x+2)的余式分别是1和-17

设则4S的整数部分等于______．

A.条件(1)充分，但条件(2)不充分B.条件(2)充分，但条件(1)不充分C.条件(1)和(2)单独都不充分，但条件(1)和(2)联合起来充分D.条件(1)充分

若m2+n2-2k2=0

某班学生去植树，全班人数的去挖树坑，余下人数的运树苗，最后余下的4名同学负责供应开水