某商店搞促销活动，一手机现在每部售价600元，获利20%，如果按原售价可获利30

若∃x∈(1， 5 2 )，使函数g(x)=log2(tx2+2x-2)有意义，则t的取值范围为______．

阅读下面文章，完成问题。

　　①海洋是永不止息的，风从不会平，浪从不会静。但是在海底深处，却有一个风吹不到浪打不到的地方，叫做“海底坐垫”。任狂风暴雨搅翻大海，任龙吟海啸波涌浪滚，那个地方从来不会被搅动。当科学家挖掘海底，把“海底坐垫”上的动植物遗骸拿上来检测时，证实了这些遗骸一动不动地被存放了数千年之久，从未受到过打扰。

　　②据说台风的中心也是平静的。

　　③我们在生活中，又何尝不是如处于大海之中或台风之中？到处都是声音，人的声音以及各种物体发出的声音。甚至当我们越是想安静的时候，就越有一种大吵大闹的声音传到耳中，里里外外的喧嚷声不下上千种，烦你、扰你、推你、拉你，以致除了这种喧嚷声之外，你再也听不到别的声音，更听不到自己灵魂里的声音。

　　④这时候你要继续静下去，也必须在嘈杂中有时间让自己安静在一个地方，让外界的噪音达不到，也让你心里的每个闯入者不作声，如同安静的日落。当你对外面的一切噪音充耳不闻时，渐渐地那些噪音就会消失，你会听到从自己的心灵深处发出一种极微小的神秘音调，有无法形容的温柔和安慰的能力，那就是从你自己灵魂里发出的声音。

　　⑤越是嘈杂的生命，忙乱的生命，越应该找到这种内在的静，倾听自己生命的歌唱。那才是自己的声音，才是真实的自己。

　　⑥人永远无法自己满足自己，人在绝望中也无法解脱自己，认识自己的软弱才能坚强，体验过惧怕才会勇敢。

　　⑦生活并不是单纯的经济行为，生命的更新才是一切改革的根基。历史是我们自己的影像，在历史和别人的错误里能看到自己的责任，才是真智慧中的开明。在有强光的地方必有暗影，但在阴暗的地方更容易获得丰富和珍贵的启示。

　　⑧在倾听自己的过程中，沉思蔽想，整理自己的思路，靠近自己，充实自己，会认识自己的命运，恢复自己所有的能力，然后才可能调动全部精力去做好应该做的事情。

　　⑨这种“静”能医治痛苦和沮丧，给人带来改变生活的力量。

　　⑩痛苦和沮丧这两种东西，是人生中不可能避免的。逆风能使船舶进港，沉重的钟摆能使指针移动，世上许多美好的事物都是能通过眼泪和痛苦得到的。静思反观这些痛苦，才会使人深刻和丰富，并有可能成为灵性上的伟人。而沮丧，却是一种危险的引诱，使人的心脏衰弱，把困难扩大，给世间描绘上一层凶险的颜色。能够静下来跟自己对话的人，不是没有痛苦，而是从不沮丧。

　　这种“静”也能让心灵吸吮生命的气息，体验那一种不可诠释的感情，超然有世外感；静谧，清畅，找到人同外部世界的连带感，找到与灵魂相熨帖的东西。让疲惫的身心重新投进生命之中，让生命本性的渴求得到满足，这是心灵的拯救。

　　“海底坐垫”是给海洋以静力和智慧的地方。心里有这样一个“海底坐垫”的人，必有海洋般的性格和胸襟，堪称大气。（摘自《郑州日报》）

1．“心灵的'海底坐垫”'在文中指的是什么？

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2．“心灵的'海底坐垫”'能够在我们的生活中发挥怎样的作用？

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3．文章语言富有哲理，给人启迪。请从文中找出你最受启发的一句，谈谈自己的理解。

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为了判断两个字符串s1和s2是否相等，应当使用（）

A.if（s1==s2）

B.if（s1=s2）

C.if（strcmp（s1，s2））

D.if（strcmp（s1，s2）==0）

简述长期咨询顾问的职责或主要的工作内容。

Questions 1～5

Writing articles about films for The Front Page was my first proper job. Before then I had done bits of reviewing—novels for other newspapers, films for a magazine and anything I was asked to do for the radio. That was how I met Tom Seaton, the first arts editor of The Front Page, who had also written for radio and television. He hired me, but Tom was not primarily a journalist, or he would certainly have been more careful in choosing his staff.
At first, his idea was that a team of critics should take care of the art forms that didn’t require specialized knowledge: books, TV, theatre, film and radio. There would be a weekly lunch at which we would make our choices from the artistic material that Tom had decided we should cover, though there would also be guests to make the atmosphere sociable.
It all felt a bit of a dream at that time: a new newspaper, and I was one of the team. It seemed so unlikely that a paper could he introduced into a crowded market. It seemed just as likely that a millionaire wanted to help me personally, and was pretending to employ me. Such was my lack of self-confidence. In fact, the first time I saw someone reading the newspaper on the London Underground, then turning to a page on which one of my reviews appeared, I didn’t know where to look.
Tom’s original scheme for a team of critics for the arts never took off. It was a good idea, but we didn’t get together as planned and so everything was done by phone. It turned out, too, that the general public out there preferred to associate a reviewer with a single subject area, and so I chose film. Without Tom’s initial push, though, we would hardly have come up with the present arrangement, by which I write an extended weekly piece, usually on one film.
The space I am given allows me to broaden my argument—or forces me, in an uninteresting week, to make something out of nothing. But what is my role in the public arena I assume that people choose what films to go to on the basis of the stars, the publicity or the director. There is also such a thing as loyalty to "type" or its opposite. It can only rarely happen that someone who hates westerns buys a ticket for one after reading a review, or a love story addict avoids a romantic film because of what the papers say.
So if a film review isn’t really a consumer guide, what is it I certainly don’t feel I have a responsibility to be "right" about a movie. Nor do I think there should be a certain number of "great" and "bad" films each year. All I have to do is put forward an argument. I’m not a judge, and nor would I want to be.

Which of the following best describes what the author says about his work

A. He can freely express his opinion.
B. He prefers to write about films he likes.
C. His success varies from year to year.
D. He writes according to accepted rules.