棕榈树
亚洲并非棕榈树的原产地，在这儿传统上用手工为棕榈树传递花粉，这种办法使棕榈果实产量非常低。当1980年将作为棕榈花的有效授粉者而被熟知的象鼻虫引进亚洲后，棕榈的产量上升——在某些地区上升了50%——但在1984年急剧下降。以下哪一项如果是正确的，将对1984年产量的下降提出最好的解释？（）
A．随着产量的上升同时需求下降，1980-1984年之间，棕榈果实的价格持续下跌
B．进口树经常比本地树树产量更大，因为进口树将它们的害虫与疾病留在它们本国的土地上
C．产量的迅速提高耗尽了培育果实的雌花生长需要的营养物质
D．在1980--1984年之间，亚洲象鼻虫的数量保持在相同的水平上
亚洲并非棕榈树的原产地，在这儿传统上用手工为棕榈树的花授粉，这种办法使棕榈果实产量非常低。当1980年将作为棕榈花的有效授粉者而被熟知的象鼻虫引进亚洲后，棕榈果实产量上升，在某些地区上升了50%，但在1984年急剧下降。
以下哪一项，如果是正确的，将对1984年产量的下降提出最好的解释?
A．随着产量的上升同时需求下降，1980年到1984年之间，棕榈果实的价格持续下降。
B．进口树经常比本地树产量更大，因为进口树将它们的害虫与疾病留在它们本国的土地上。
C．产量的迅速提高耗尽了培育果实的雌花生长需要的营养物质。
D．在1980年到1984年之间，亚洲象鼻虫的数量保持在相同的水平上。
亚洲并非棕榈树的原产地，在这儿传统上用手工为棕榈树传递花粉，这种办法使棕榈果实产量非常低。当l980年将作为棕榈花的有效授粉者而被熟知的象鼻虫引进亚洲后，棕榈的产量上升——在某些地区上升了50%——但在1984年急剧下降。以下哪一项如果是正确的，将对l984年产量的下降提出最好的解释？（）。
A．随着产量的上升同时需求下降，1980～1984年之间，棕榈果实的价格持续下跌
B．进口树经常比本地树树产量更大，因为进口树将它们的害虫与疾病留在它们本国的土地上
C．产量的迅速提高耗尽了培育果实的雌花生长需要的营养物质
D．在1980～1984年之间，亚洲象鼻虫的数量保持在相同的水平上
棕榈岛是波斯湾畔的独特风景，下列对其描述正确的是哪一项？（）
A、因大量种植棕榈树而闻名的小岛
B、因出产棕榈油闻名的小岛
C、形似棕榈叶的人工岛
D、位于阿联酋首都阿布扎比海滨
A.三坊七巷的历史
B.三坊七巷的走向
C.三坊七巷的建筑
D.三坊七巷的格局
有“明清古建筑博物馆”之称的三坊七巷街区，有人将其比喻为鱼骨与鱼刺，有人则形容为菩提树叶，或直呼为“非”字形。笔者觉得，它倒更像一片优美的棕榈树枝叶，南后街似叶片的主脉，向西伸出的三条支脉为三坊，向东生出的七条细脉是七巷。由北向南的三坊依次为衣锦坊、光禄坊、文儒坊，七巷的顺序依次为杨桥巷、郎官巷、塔巷、黄巷、安民巷、官巷和吉庇巷。对这段文字的内容概括最恰当的一项是：
A.三坊七巷的历史
B.三坊七巷的走向
C.三坊七巷的建筑
D.三坊七巷的格局
A.事物发展的方向是前进的、上升的；道路是曲折的、迂回的
B.自然界的物质性要求人们在改造自然的过程中应尊重自然，与自然和谐相处
C.规律具有客观性，违背规律就会受到规律的惩罚
D.实践是检验真理的唯一标准，应坚持实践的观点
E.一切事物都存在两个方面，应坚持用一分为二的观点和全面的观点看问题
A.事物发展的方向是前进的、上升的，道路是曲折的、迂回的
B.自然界的物质性要求人们在改造自然的过程中应尊重自然，与自然和谐相处
C.规律具有客观性，违背规律就会受到规律的惩罚
D.实践是检验认识真理性的唯一标准，应坚持实践的观点
E.一切事物都存在两个方面，应坚持用一分为二的观点和全面的观点看问题
There are at least 8 million unique species of life on the planet, if net far more, and you could be forgiven for believing that all of them can be found in Andasibe. Walking through this rain forest in Madagascar is like stepping into the library of life. Sunlight seeps through the silky fringes of the Ravenea louvelii, an endangered palm (棕榈树) found, like so much else on this African island, nowhere else.
Madagascar which separated from India 80 million to 100 million years ago before eventually settling off the southeastern coast of Africa, is in many ways an Earth apart. All that time in geographic isolation made Madagascar a Darwinian playground, its animals and plants evolving into forms utterly original. Some 90% of the island's plants and about 70% of its animals arc endemic, meaning that they arc found only in Madagascar. But what makes life on the island unique also makes it uniquely vuhnerable, which means if we lose these animals on Madagascar, they're gone forever.
That loss seems likelier than ever because the animals are under threat as never before. Once lushly forested, Madagascar has seen more than 80% of its original vegetation cut down or burned since humans arrived at least 1500 years ago, fragmenting habitats and leaving animals effectively homeless. Unchecked hunting wiped out a number of large species, and today mining, logging and energy exploration threaten those that remain. It has an area the size of New Jersey in Madagascar that is still under forest, and all this incredible diversity is crammed into it.
Madagascar is a conservation hot spot a term for a region that is very biodiverse and particularly threatened--and while that makes the island special, it is hardly alone. Conservationists estimate that extinctions worldwide are occurring at a pace that is up to 1 000 times as great as history's background rate before human beings began scattering. Worse, that die-off could be accelerating.
Price of Extinction
There have been five extinction waves in the planet's history—including the Permian (二叠纪的) extinction 250 million years ago, when an estimated 70% of all terrestrial animals and 96 % of all marine creatures vanished, and, most recently, the Cretaceous (白垩纪的) event 65 million ),ears ago, which ended the reign of the dinosaurs. Though scientists have directly assessed the viability of fewer than 3% of the world's described species, the sample polling of animal populations so far suggests that we may have entered what will be the planet's sixth great extinction wave. And this time the cause isn't an unsteady planet or volcanoes. It's us.
Through our growing numbers, our thirst for natural resources and, most of all, climate change-- which, by one reckoning, could help carry off 20% to 30% of all species before the end of the century-- we're shaping an Earth that will be biologically exhausted. A 2008 assessment by the: International Union for Conservation of Nature found that nearly 1 in 4 mammals worldwide were at risk for extinction, including endangered species. Over fishing and acidification of the oceans are threatening marine species as diverse as the corals.
Scary for conservationists, yes. but the question arises: Why should it matter to the rest of us? After all, nearly all the species that were ever alive in the past are gone today. Evolution demands extinction. When we're using the term extinction to talk about the fate of the US auto industry, does it really matter if we lose species like the Yangtze River dolphin and the golden toad, all of which have effectively disappeared in recent years? What docs the loss of a few species among millions matter?
For one thing, we're animals too, dependent on this planet like every other form. of life. The more species living in an ecosystem, the healthier and more productive it is, which matters for us--a recent study by the World Wildlife Fund (WWF) e
A．At least 8 million unique species of life.
B．More than 8 million unique species of life.
C．A library of life