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包裹的分類?

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一類包裹:自發(fā)刊日起5日以內(nèi)的報紙:中央、省級政府宣傳用非賣品:新聞圖片和中、小學(xué)生課本。二類包裹:搶險救災(zāi)物資，書刊，鮮或凍魚介類、肉、蛋、奶類、果蔬類。三類包裹:不屬于一、二、四類包裹的物品。四類包裹: (1)- 級運(yùn)輸包裝的放射性同位素、 油樣箱、摩托車; (2)泡沫塑料及其制品: (3) 國務(wù)院鐵路主管部門]指定的其他需要特殊運(yùn)輸條件的物品。

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As Gilbert White，Darwin ， and others observed long ago， all species appear to have theinnate capacity to increase their numbers from generation to generation. The task forecologistsis to untangle the environmentaand biologicalfactorsthat hold this intrinsiccapacity for population growth in check over the long run. The great variety of dynamicbehaviorsexhibitedby differentpopulationmakes thistaskmore difficult：sompopulations remain roughly constant from year to year; others exhibit regular cycles ofabundance and scarcity; still others vary wildly， with outbreaks and crashes that arein some cases plainly correlated with the weather， and in other cases not.To impose some order on this kaleidoscopeof patterns ， one school of thought proposesdividing populations into two groups. These ecologists posit that the relatively steadypopulations havedensity-dependent growth parameters; that is， rates ofbirth ， death ，and migrationwhich depend strongly on population density. The highly varying populationshave density-independent growth parameters， with vital rates buffeted by environmentalevents ;these rates fluctuate in a way that is wholly independent of population density.This dichotomy has its uses， but it can cause problems if taken too literally. Forone thing ， no population can be driven entirely by density-independent factors all thetime. No matter how severely or unpredictably birth， death ， and migration rates may befluctuatingaround theirlong-termaverages ， ifthere were no density-dependenteffects ，the populationwould ， in the long run ， eitherincrease or decrease without bound (barringa miracle by which gains and losses canceled exactly)。 Put another way， it may be thaton average 99 percent of all deaths in a populationarise from density-independentcauses ，and only one percent from factors varying with density.The factorsmaking up the one percentmay seem unimportant， and their cause may be correspondingly hard to determine. Yet，whether recognized or not， they will usually determine the long-term average populationdensity.In order to understand the nature of theecologist ’s investigation， we may think ofthe density-dependent effectson growth parameters as the signal ecologists are trying toisolateand interpret， one that tends to make the population increase from relativelylowvalues or decrease from relatively high ones， while the density-independent effects actto produce noise in the populationdynamics.For populationsthatremain relativelyconstant ， or that oscillate around repeated cycles， the signal can be fairly easilycharacterized and its effects described， even though the causative biological mechanismmay remain unknown. For irregularly fluctuating populations， we are likely to have toofew observations to have any hope of extracting the signal from the overwhelming noise.But it now seems clear that all populationsare regulatedby a mixture of density-dependentand density-independent effects in varying proportions. 1. The author of the text is primarily concerned with [A] Discussing two categories of factorsthat controlpopulationgrowth and assessingtheir relative importance. [B] Describinghow growth ratesin naturalpopulationsfluctuateover time andexplaining why these changes occur. [C] Proposing a hypothesisconcerning population size and suggesting ways to test it. [D] Posing a fundamental question about environmentalfactorsin populationgrowth andpresenting some currently accepted answer. 2. It can be inferred from the text that the author considers the dichotomy discussedto be [A] Applicable only to erratically fluctuating populations. [B] instrumental， but only if its limitations are recognized. [C] Dangerously misleading in most circumstances. [D] A complete and sufficient way to account for observed phenomena. 3.to the text ， allof the followingbehaviors have been exhibitedby differentpopulations EXCEPT [A] Roughly constant population levels from year to year. [B] Regular cycles of increases and decreases in numbers. [C] Erratic increases in numbers correlated with the weather. [D] Unchecked increases in numbers over many generations. 4. The discussion concerning population in the third paragraph serves primarily to [A] Demonstrate the difficultiesecologistsface in studying density-dependentfactorslimiting population growth. [B] Advocate more rigorous study of density-dependent factors in population growth. [C] Prove that the death rates of any populationare never entirelydensity-independent. [D] underline the importance of even small density-dependent factors in regulatinglong-term population densities. 5. In the text， the author does all of the following EXCEPT [A] Cite the views of other biologists. [B] Define a basic problem that the text addresses. [C] Present conceptual categories used by other biologists. [D] Describe the results of a particular study.
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A friend of mine was fond of drawing horse. He drew the horses very well,but he always began the tail. Now it is the Western rule to begin at the head of the horse, that is why I was surprised. It struck me that it could not really make any difference whether the artist begins at the head or the tail or the belly(肚子) or the foot of the horse, if he really knows his business. And most great artists who really know their business do not follow other people’s rule.They make their own rules. Every one of them does his work in a way peculiar(奇特的) to himself; and the peculiarity means only that he finds it more easy to work in that way. Now the very same thing is true to literature(文學(xué)). And the question, "How shall I begin?" only means that you want to begin at the head instead of beginning at the tail or somewhere else. That is, you are not yet experienced(有經(jīng)驗的) enough to trust to your own powers. When you become more experienced you will never ask the question, and I think that you will often begin at the tail --that is to say, you will write the end of the story before you have even thought of the beginning. 1. A friend of the writer’s drew the horses ____. A. very well B. in the way of western rule C. in the way of his own rule D. all of the above 2. The writer was surprised because ____. A. the artist began to draw at the head of the horse B. the artist began to draw at the tail of the horse C. the artist made his own rule D. the artist did not follow other people’s rule 3. You are not yet experienced because ____. A. you don’t know where to begin B. you want to begin at the head instead of beginning at the tail C. you always asked question D. you do not trust to your own powers 4. When you become more experienced you will ____. A. never ask question B. often begin at the tail C. should write the end of the story D. should think of the beginning 5. The topic of the passage is ______. A. How to draw a horse B. How to write a story C. How to make your own rules D. Trust to your own powers
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