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(一) 位于市区的某建筑工程公司具备建筑行政部门批准的建筑业施工资质，2011年10月发生如下经营业务： (1)承建甲企业办公楼，合同中约定，甲企业提供电梯，价款350万元。该办公楼10月竣工并一次性结算工程价款1500万元，同时收取劳动保护费20万元、抢工费15万元，全优工程奖20万元。 (2)本年和某公司合作建立一家五星级酒店，自己将一座10层办公楼转入合资公司，不承担风险，每月约定取得100万元投资回报，本月已经收到该笔款项。 (3)乙企业长期拖欠建筑公司工程价款6000万元，经双方协商，乙企业将其一栋写字楼抵顶工程价款。写字楼原价5000万元，已提折旧1000万元，评估价4000万元，乙企业另支付银行存款2000万元。建筑公司对该写字楼重新装修后销售，取得销售收入6400万元，发生装修费支出800万元。 (4)承包某酒店室内装修工程，装饰、装修劳务费800万元、辅助材料费用30万元；酒店自行采购装饰材料的价款900万元及中央空调设备价款100万元。 (5)销售自建商品房，取得销售收入6000万元(其中包括代收的住房专项维修基金200万元)，该商品房工程成本2600万元。(建筑劳务成本利润率20%。) 根据上述资料，回答下列问题：计算业务(2)当月应缴纳营业税( )万元。

A. 3
B. 0
C. 5
D. 4.5

设函数f(x)=-x(x-a)2(x∈R)，其中a∈R． (1)当a=1时，求曲线y=f(x)在点(2，f(2))处的切线方程； (2)当a≠0时，求函数f(x)的极大值和极小值，

We unemployed share a social stigma (耻辱) similar to that of the rape victim. Whether consciously or subconsciously, much of the work-ethic driven public feels that you’ve somehow "asked for it". Secretly wanted to lose your job and "flirted (幻想)" with unemployment through your attitude- probably dressed in a way to invite it (left the vest unbuttoned on your three-piece suit). But the worse of it isn’t society’s work-ethic morality; it’s your own, which you never knew you had. You find out how much self-satisfaction was gained from even the most simple work-related task: a well-worded letter, a well-handled phone call, even a clean file. Being useful to yourself isn’t enough. But then almost everyone has heard about the need to be a useful member of society. What you didn’t know about was the loneliness. You’ve spent your life almost constantly surrounded by people, in classes, in dorms and at work. To suddenly find yourself with only your cat to talk to all day distorts (歪曲) your sense of reality. You begin to worry that fights of fancy might become one way. But you always were, and still are, stronger than that. You maintain balance and perspective, mainly through resorting frequently to sarcasm (嘲笑) and irreverence. Although something going wrong in any aspect of your life now seems to push you into temporary despair much more easily than before, you have some very important things to hang on to-- people who care, your sense of humor, your talents, your cat and your hopes. And beyond that, you’ve gained something- a little more knowledge and a lot more compassion. You’ve learned the value of the routine you scorned and the importance of the job you took for granted. But most of all, you’ve learned what a "7.6 percent unemployment rate" really means. What does "work-ethic" refer to

A. Crazy attitude toward work.
B. Public attitude toward work.
C. People who are working.
D. People who are out of work.

What are black holes This question is difficult to answer, since we do not have the necessary words to describe them. Scientists think that a black hole is a region of space into which matter has fallen and from which nothing can escape. So we cannot see a black hole. A black hole exerts a strong gravitational pull and yet it has no matter. It is only space. The exploration of black holes is just beginning. There are many speculations about them. There might be a huge hole at the centre of our galaxy swallowing up stars at a very rapid rate. Mankind may one day meet this fate. On the other hand, scientists have suggested that very advanced technology could one day harness the energy of black hole for human’s use on earth. These speculations sound like science fictions. But the theory of black holes is accepted by many scientists and astronomers.