试述国内外的主要砂岩分类方案,主要依据,并评价之?

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问题:

试述国内外的主要砂岩分类方案,主要依据,并评价之?

考点:地球科学沉积岩石学沉积岩石学题库
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下面关于南极地区叙述正确的有[ ]

A、风库 

B、气候湿润 

C、南极的主人——企鹅 

D、矿产资源贫乏

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课外阅读。
我的房东
       我在新加坡留学时的房东先生是一个很独特的人。
  他很富有,又很贫穷;他很慷慨,又很吝啬。
  他拥有一幢价值36万美元的两层花园洋房,十几万的股票,2万美元的汽车。退休前的他是电子工程师,收入很高。退休后他每月拿退休金,还时不时地赚些外快。他无子无女。所有这一切都显示他是一个富有的中产阶级人士。但是,让我们来看一下他的生活:新鲜橙汁舍不得买,只买听装浓缩橙汁,回来兑水;面包也舍不得买,自己在家做;一日三餐简单得让人觉得难以下咽:两三片面包,有时涂点花生酱,几片生菜叶,外加一杯牛奶,有时加一只烤土豆。我从没见他做过鱼、肉、鸡、鸭等荤菜。
       他是个守财奴吗?住了一段时间后,我才知道,他每年都大量捐款给各种慈善机构,并且赞助过很多中国留学生完成学业。
       由于以前我在香港工作的时候就认识房东先生,所以他以很便宜的租金让我住在他家。除了我以外,他家还住有6名中国留学生。他的家成了中国之家,他逢人总是自豪地说我们都是他的孩子。
       住进他家的第二天,他邀我出门散步,我欣然答应了。没想到,他一出门,就捡起了垃圾,路边的废纸屑、果皮、饮料杯,他都一一捡起扔进垃圾桶里。别人家的报纸散落在地,他也拉起来整理好,放在门前。有时一些废纸果皮正好在肮脏的水坑里,他也毫不在乎地捡起扔进垃圾桶。
       跟他走一段路后,我从惊讶到犹豫再到脸红。我为自己的虚荣心感到脸红。于是,我也袖口一卷,加入了捡垃圾的行列。而实际上,路人的脸上并没有不屑,而是写着理解和尊重,他看见地上有一个易拉罐,就一脚踩扁,捡起放进口袋,并且得意地说:“可以卖几分钱呢!”看见地上有一分硬币,又马上捡起来,像个孩子似的唱起了他童年时代的儿歌:“谁抢到,谁收起;谁丢了,谁哭泣!”一脸天真烂漫的笑容。
       这是我在留学期间的最难忘的一件事,那首歌也是我最难忘的一首儿歌。后来,我才知道,每个周末上午出门捡垃圾是房东先生的例行公事。于是,只要有空,每个周末上午我都会和他一起出门捡垃圾,我们美其名曰:“出门散步。”
       这是我以往从未有过的感觉和体验。我把我的一切虚荣心都抛进了垃圾箱,我懂得了……
1.“我”在文中的作用是:                                                                         。 
2.文中“最难忘的一件事”指:                                                                             
3.“那首歌”是“我最难忘的”的原因是:                                                                            
4.下面对文章的分析不正确的一项是
[ ]
     A.文章开头一句话独立成段,只突出了人物的“独特”。
     B.文章紧扣中心选材,材料典型,结构严谨。
     C.文章详略得当,详写了房东先生捡垃圾的情节。
     D.文章在刻画房东先生这一人物时,运用了行动、神态、语言描写。
5.房东先生的“独特”在于:(用文中的话回答)                                                                     
6.请你用三个短语概括房东先生的形象:                                                                       
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滑石粉炒时的注意事项是什么?

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下面关于函数依赖的叙述中,不正确的是

A.若X→Y,X→Z,则X→YZ

B.若XY→Z,则X→Z,Y→Z

C.若X→Y,Y→Z,则X→Z

D.若X→Y,Y' Y,则X→Y'

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In 1880, Sir Joshua Waddilove, a Victorian philanthropist, founded Provident Financial to provide affordable loans to working-class families in and around Bradford, in northern England. This month his company, now one of Britain’s leading providers of "home credit"— small, short-term, unsecured loans—began the nationwide rollout of Vanquis, a credit card aimed at people that mainstream lenders shun. The card offers up to £ 200 ($ 380) of credit, at a price: for the riskiest customers, the annual interest rate will be 69%.

Provident says that the typical interest rate is closer to 50% and that it charges no fees for late payments or breaching credit limits. Still, that is triple the rate on regular credit cards and far above the 30% charged by store cards. And the Vanquis card is being launched just when Britain’s politicians and media are full of worry about soaring consumer debt. Last month, a man took his own life after running up debts of £ 130000 on 22 different credit cards.

Credit cards for "sub-prime" borrowers, as the industry delicately calls those with poor credit records, are new in Britain but have been common in America for a while. Lenders began issuing them when the prime market became saturated, prompting them to look for new sources of profit. Even in America, the sub-prime market has plenty of room for growth. David Robertson of the Nilson Report, a trade magazine, reckons that outstanding sub-prime credit-card debt accounts for only 3% of the $ 597 billion that Americans owe on plastic. The sub-prime sector grew by 7.9% last year, compared with only 2.6% for the industry as a whole.

You might wonder, though, how companies can make money from lending to customers they know to be bad risks—or at any rate, how they can do it legitimately. Whereas delinquencies in the credit-card industry as a whole are around 4%-5% , those in the sub-prime market are almost twice as high, and can reach 15% in hard times.

Obviously, issuers charge higher interest rates to compensate them for the higher risk of not being repaid. And all across the credit-card industry, the assessment and pricing of risks has been getting more and more refined, thanks largely to advances in technology and data processing. Companies also use sophisticated computer programs to track slower payment or other signs of increased risk. Sub-prime issuers pay as much attention to collecting debt as to managing risk; they impose extra charges, such as application fees; and they cap their potential losses by lending only small amounts ($ 500 is a typical credit limit).

All this is easier to describe than to do, especially when the economy slows. After the bursting of the technology bubble in 2000, several sub-prime credit-card providers failed. Now there are only around 100, of which nine issue credit cards. Survivors such as Metris and Providian, two of the bigger sub-prime card companies, have become choosier about their customers’ credit histories.

As the economy recovered, so did lenders’ fortunes. Fitch, a rating agency, says that the proportion of sub-prime credit-card borrowers who are more than 60 days in arrears (a good predictor of eventual default) is the lowest since November 2001. But with American interest rates rising again, some worry about another squeeze. As Fitch’s Michael Dean points out, sub-prime borrowers tend to have not just higher-rate credit cards, but dearer auto loans and variable-rate mortgages as well. That makes a risky business even riskier.

Vanquis is different from regular cards in that()

A. it charges its users no fees at all

B. it leads to a decrease in consumer debt

C. it leads to an increase in consumer debt

D. it charges its users higher interest rates

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