单选题某城市计划从今年开始经过两年的时间，将城市绿地面积从今年的144万平方米提高到225万平方米，则每年平均增长( )．

单选题设函数f(x)=cos(x+y)，则等于

单选题设f(x)是可导的连续函数，则等于______．A．f(3)-f(1)B．f(9)-f(3)C．D．

单选题设f(x)的定义域是[-1,0]，的定义域是()。

单选题If the opinion polls are to be believed, most Americans are coming to trust their government more than they used to. The habit has not yet spread widely among American Indians, who suspect an organization which has so often patronized them, lied to them and defrauded them. But the Indians may soon win a victory in a legal battle that epitomizes those abuses. Elouise Cobell, a banker who also happens to be a member of the Blackfeet tribe in Montana, is the leading plaintiff in a massive class-action suit against the government. At issue is up to $10 billion in trust payments owed to some 500,000 Indians. The suit revolves around Individual Indian Money (11M) accounts that are administered by the Interior Department's Bureau of Indian Affairs (BIA). Back in the 1880s, the government divided more than 11m acres of tribal land into parcels of 80 to 160 acres that were assigned to individual Indians. Because these parcels were rarely occupied by their new owners, the government assumed responsibility for managing them. As the Indians' trustee, it leased the land out for grazing, logging, mining and oil drilling--but it was supposed to distribute the royalties to the Indian owners. In fact, officials admit that royalties have been lost or stolen. Records were destroyed, and the government lost track of which Indians owned what land. The plaintiffs say that money is owing to 500,000 Indians, but even the government accepts a figure of about 300,000. For years, Cobell heard Indians complain of not getting payment from the government for the oil-drilling and ranching leases on their land. But nothing much got done. She returned to Washington and, after a brush-off from government lawyers, filed the suit. Gale Norton, George Bush's interior secretary was charged with contempt in November because her department had failed to fix the problem. In December, Judge Lam berth ordered the interior Department to shut down all its computers for ten weeks because trust-fund records were vulnerable to hackers. The system was partly restored last month and payments to some Indians, which had been interrupted l resumed. And that is not the end of it. Ms Norton has proposed the creation of a new Bureau of Indian Trust Management, separate from the BIA. Indians are cross that she suggested this without consulting them. Some want the trust funds to be placed in receivership, under a , neutral supervisor. Others have called for Congress to establish an independent commission, including Indians, to draw up a plan for reforming the whole system. A messy injustice may at last be getting sorted out.

单选题下列不定积分计算正确的是A．∫x2dx=x3+CB．C．∫sinxdx=cosx+CD．∫cosxdx=sinx+C

单选题关于x的方程k2x2+(2k-1)x+1=0有实数根，则下列说法正确的是______。A．当时方程两根互为相反数B．当k=0时方程的根是x=-1C．当k=±1时方程两根互为倒数D．当时方程有实数根

单选题则n的最小值为()。

单选题级数(k为非零常数)______

单选题设函数f(x)=e x lnx，则f"(1)=

单选题当x＝时，3(x+5)(x-3)-5(x-2)(x+3)的值等于()．

单选题使成立的f(x)为______A．B．C．e-xD．

单选题双纽线(x2+y2)2=x2-y2所围成的区域面积可用定积分表示为______A．．B．．C．．D．．

单选题若cosx是f(x)的一个原函数，则∫xf"(x)dx等于______

单选题在△ABC中，已知，给出以下四个论断：①tanA·cotB=1；②；③sin2A+cos2B=1；④cos2A+cos2B=sin2C，其中正确的有()个．

单选题设f(x)为连续函数，则等于()．

单选题某商店出售某种商品每件可获利m元，利润率为20%，若这种商品的进价提高25%，而商店将这种商品的售价提高到每件仍可获利m元，则提价后的利润率为______。

单选题一批货物要运进仓库，由甲、乙两队合运9小时可运进全部货物的50%，乙队单独运则要30小时才能运完，又知甲队每小时可运进3吨，则这批货物共有( )吨． (A)135 (B)140 (C)145 (D)150 (E)A、B、C、D均不正确

单选题设函数y=f(x)由方程cosxy+lny-x=1确定，则

单选题如下不等式成立的是( )．