采用百分率法进行市场状况调整的一般公式为（）。 A.可比实例在成交日期时的价格×市场

阅读下面课外现代文，回答18——21题。

爱是最温暖的冰块

大学毕业后，怀着一腔热情，我兴致勃勃地选择了支援贫困县。根据统一安排，我被分配到一个既偏僻又贫穷的山村小学。说偏僻，是因为那里没有一条柏油路，交通不便，十分闭塞；说贫穷，是因为学校连粉笔都没有，上课写字只能用手指蘸着水进行。就这样，不出两个月，我的热情骤降，无精打采的，一直想找个机会回城里。

那些小孩子看出了我没有刚来时的积极和认真，便纷纷围上来仰起脸问:“老师，你是不是要走了？”我一惊，问:“你们怎么知道？”

“因为以前来过好几个老师，刚教一个多月就走了，他们嫌我们这里太穷太辛苦。老师你也真的要走？”

我一时不知所措，便笑起来，说:“你们放心吧，老师不会走的，老师还没有教会你们知识呢！”

他们一听，欢呼着一哄而散，像得到了什么重大喜讯似的。

转眼到了冬天，我想暂时就先在这里再呆一阵子，等到春天无论如何也得离开。已经有几个同学在城市里帮我找了份工作，只差我过去了。

可是，没想到这里的冬天特别寒冷，经常零下十几度，小河里、路沟里的水都结了一层厚厚的冰，并且井里的水也压不出来，估计也是被冻住了。

在课堂上，我无比烦躁又无可奈何地说:“找不到水，这可麻烦了，我怎么给大家写字呢？”

有一个孩子站起来说:“老师，你可以拿冰块写嘛！”

于是，我找来几块冰，在黑板上写起来，字体果然很清晰，写着也方便。只是这太冻手了，写不了几个字，手就会变得麻木起来，捏不住冰块。没办法，我只有写几个字停下来将手插入口袋里暖一暖，然后再继续写。

这些孩子坐在下面看见了我这个滑稽的动作，有的忍不住嘿嘿地低声笑。

这样写写停停，停停写写，一节课下来把我累得实在不轻。算了吧，明天就只看不写了，带领他们多朗读课文吧。我下定决心。

可是第二天我一上讲台，一个冻得鼻涕流得老长的小男孩跑过来，伸开手，把一块冰递给我，说:“老师，这块冰我已经暖一会了，你摸摸，一点都不凉了，你拿着写字吧。”

我接过来捏在手里，果然暖融融的，不那么冰手了。

不过片刻之后，我就不禁噗嗤笑了一声，心想这些孩子想得也太幼稚了，这冰块暖得越热它不就融化得越快吗？像这样一个冰块能写几个字呢？

于是，我说:“一块冰不够用的，我们还是先念课文吧！”

可是，下面的一幕让我终生难忘。只见台下的五六十个孩子都齐刷刷地站了起来，伸开手高喊着:“老师，我这也有冰块！”“我这也有！”“我这也有！”

那是怎么一个场面呵，在飘荡着寒气的教室里，瘦小的身子、破烂的衣服、满是污垢的头发、冻得红扑扑的脸庞——他们就那么站着，胳膊伸得笔直，摊开的小手心里都有一块亮晶晶的冰。

我一时说不出话来，鼻子有些发酸，心里感觉猛地一震。我急忙扶着讲桌，睁大了眼睛……

就这样，我最终还是留在了这所小学，婉言谢绝了朋友们的邀请。因为这些孩子对我特别尊重，因为我知道他们需要知识需要我，因为我觉得我的存在将会改变他们的未来，因为他们已经改变了我，使我明白那温暖的冰块里，隐藏着深深的爱！

小题1:请用简洁的语言概括文章的主要内容。

小题2:认真阅读文章，说一说我在贫困山区的支教遇到了哪些困难？

小题3:文中说“我一时说不出话来，鼻子有些发酸，心里感觉猛地一震。我急忙扶着讲桌，睁大了眼睛……”其中的“发酸”“一震”等词语，表现了“我”当时怎样的心情？

小题4:根据文章内容说一说“我”最终留在了这所学校的原因是什么？

每日营业终了，二次销号人员对柜员当日（）的重要空白凭证进行核对。

A.领入

B.使用

C.售出

D.作废

保健食品生产者必须按照批准的内容组织生产，不得改变企业产品质量标准以及产品名称、标签、说明书，不得改变

A．食品原料的产地
B．加工食品的包装
C．生产车间的设备
D．产品的配方、生产工艺
E．消毒工艺可作调整

The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, although nobody knows exactly when he acquired the use of the latter.
41) ______ Animals have a few cries that serve as signals, but even the highest apes have not been found able to pronounce words, even with the most intensive professional instruction. The superior brain of man is apparently a necessity for the mastering of speech. When man became sufficiently intelligent, we must suppose that he gradually increased the number of cries for different purposes. It was a great day when he discovered that speech could be used for narrative. There are those who think that in this respect picture language preceded oral language. A man could draw a picture on the wall of his cave to show in which direction he had gone, or what prey he hoped to catch. 42) ______
Two important stages came not so long before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture made possible an immense increase in the number of the human species in the regions where it could be successfully practiced. 43) ______
44) ______
These inventions and discoveries--fire, speech, weapons domestic animals, agriculture, and writing--made the existence of civilized communities possible. From about 3000 B. C. until the beginning of the Industrial Revolution less than two hundred years ago there was no technical advance comparable to these. During this long period man had time to become accustomed to his technique, and to develop the beliefs and political organizations appropriate to it. There was, of course, an immense extension in the area of civilized life. At first it had been confined to the Nile, the Euphrates, the Tigris, and the Indus, but at the end of the period in question it covered much the greatest part of the inhabitable globe. I do not mean to suggest that there was no technical progress during the time. 45) ______
[A] Probably picture language and oral language developed side by side. I am inclined to think that language has been the most important single factor in the development of man.
[B] Another fundamental technical advance was writing, which, like spoken language, developed out of pictures, but as soon as it had reached a certain stage, it was possible to keep records and transmit information to people who were not present when the information was given.
[C] With the development of civilization, primitive people who lived in caves at that time badly needed a language, which would help them to communicate with one another.
[D] The origin of language is also obscure. No doubt it began very gradually.
[E] In fact, there was progress--there were even two inventions of very great importance, namely, gunpowder and the mariner’s compass—but neither of these can be compared in their revolutionary power to such things as speech and writing and agriculture.
[F] These were, at first, only those in which nature fertilized the soil after each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end because of the physical comforts it provided.
[G] But industry was a step in human progress to which subsequently there was nothing comparable until our own machine age.

偶合器通常用铝合金制造，所以不论安装和拆卸都不允许用锤敲打。