某饭店十月份的营业额是30万元，如果按营业额的5%缴纳营业税，该饭店十月份应缴纳

敏感性分析的步骤有：①确定进行敏感性分析的经济评价指标；②选定需要分析的不确定因素；③计算敏感度系数并对敏感因素进行排序；④计算因不确定因素变动引起的评价指标的变动值；⑤计算变动因素的临界点。正确的步骤顺序为( )。

A．②→①→④→③→⑤

B．①→②→③→④→⑤

C．②→①→③→④→⑤

D．①→②→④→③→⑤

阅读下面短文，回答问题。

　　①习惯的力量很大，甚至可以影响人的一生。习惯的力量起初看起来似乎很微弱，弱如一滴水，以致常常被人忽视。但水滴石穿，当人感觉到习惯的巨大力量时，再想改变它，可谓难矣。古训“江山易改，本性难移”，对此作了形象而准确的概括。

　　②习惯有好与坏之分，好习惯造就人，而坏习惯即使不毁损人，至少也会成为绊脚石。贝多芬在音乐创作上努力保持“无日不动笔”的创作劲头，即使“有时让艺术之神瞌睡，也只为要使它醒后更兴奋”，这个伴其一生的习惯使他用雄壮的音符扼住了命运的“咽喉”；爱因斯坦说得更直接：“我没有什么时候特别的才能，不过喜欢寻根刨底地追究问题罢了。”也可以说，成功的事业和人生，其实是好习惯延续的必然结果；失败的事业与人生，则大抵是坏习惯导致的恶果。法国大作家巴尔扎克有一句话足令听者自危：“要断送一个人，只用叫他染一种嗜好。”可见坏习惯对人危害之大。

　　③苏联名著《钢铁是怎样炼成的》的作者奥斯特洛夫斯基说得好：“做习惯的主人，不要做它的奴隶！”每个人都应该以崇高的信仰和坚强的意志，改掉自己不良习惯，并时刻注意养成各种良好习惯。（王恒韶《做习惯的主人》，有删节）

1．本文第①段开宗明义提出中心论点：

__________________________________________　　

2．第②段运用____________、_____________的论证方法，论证了习惯对人的影响；第③段则提出了注意养成好习惯的希望。

3．第②段中加粗的词“这个”指代的是：_________________________。

4．认真品读第②段中画线的句子，你是否完全同意作者这一观点？请谈谈你的理由。

__________________________________________

5．你有哪些好习惯、坏习惯，谈谈你是如何看待这些习惯的。

__________________________________________

I entered St Thoma’s Hospital as a medical student at the age of 18 and spent five years there. I was an unsatisfactory student, for my heart, as you might have guessed, was not in it. I wanted, I had always wanted to be a writer, and in the evening, after my high tea, I wrote and read. Before long, I wrote a novel, called “Liza of Lambeth”, which I sent to a publisher and was accepted. It appeared during my last year at the hospital and had something of a success. It was of course an accident, but naturally I did not know that. I felt I could afford to give up medicine and make writing my profession; so, three days after I graduated from the school of medicine, I set out for Spain to write another book. Looking back now and knowing as I do the terrible difficulties of making a living by writing, I realize I was taking a fearful risk. It never even occurred to me.

The next ten years were very hard, and I earned an average of £100 a year. Then I had a bit of luck. The manager of the Court Theatre put on a play that failed ; the next play he arranged to put on was not ready , and he was at his wits’ end. He read a play of mine and, though he did not much like it, he thought it might just run for the six weeks till the play he had in mind to follow it with could be produced. It ran for fifteen months. Within a short while I had four plays running in London at the same time. Nothing of the kind had ever happened before. I was the talk of the town. One of the students at St Thomas’s Hospital asked the famous surgeon with whom I had worked whether he remembered me. “Yes, I remember him quite well, “he said. “ One of our failures, I’m afraid. “

1. Which of the following statements is not true?

A. The author was very pleased to have his book published but he didn’t realize it was something of an accident.

B. The success of his first book led the author to think he could afford to make writing his profession.

C. The author knew he was running a terrible risk when he decided to become a writer.

D. The author became a writer after graduation but was not a successful one.

2. In the second paragraph, “… he was at his wits’ end “means ________.

A. he was having a nervous breakdown       B. he was out of his wisdom

C. he did not know what to do            D. he almost went mad

3. The manager of the Court Theatre agreed to put the author’s play on the stage because _____________.

A. he thought it would run for fifteen months

B. he knew it was one of the author’s best plays shown in London

C. he had just put on a play that failed

D. the play he had arranged to put on was not ready

4. The author became the talk of the town. The reason was that __________.

A. he talked with a great many people in London about his plays

B. the plays he wrote were excellently performed in London

C. his performances in the Court Theatre were unexpectedly

D. he was criticized by an eminent surgeon as one of their failures

防治大气污染的有效措施是              。

原核生物所有编码合成代谢酶的基因在转录起始位点的上游10和35碱基处都有保守序列。对此最好的解释是，这里是( )的结合位点。

A．Rho因子
B．DNA聚合酶
C．RNA聚合酶全酶
D．核糖体