托福阅读否定事实信息题是阅读考试十大题型之一，通常每篇阅读中都会出现;tpo是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的否定事实信息题及其对应的解析，供大家参考使用。本文带来的是TPO25-3的否定事实信息题，一起来看看吧。
TPO25-3 The Evolutionary Origin of Plants
Paragraph 1：The evolutionary history of plants has been marked by a series of adaptations. The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers. All of these features appeared later in the evolutionary history of plants. Of today’s different groups of algae, green algae are probably the most similar to ancestral plants. This supposition stems from the close phylogenetic (natural evolutionary) relationship between the two groups. DNA comparisons have shown that green algae are plants’ closest living relatives. In addition, other lines of evidence support the hypothesis that land plants evolved from ancestral green algae used the same type of chlorophyll and accessory pigments in photosynthesis as do land plants. This would not be true of red and brown algae. Green algae store food as starch, as do land plants and have cell walls made of cellulose, similar in composition to those of land plants. Again, the good storage and cell wall molecules of red and brown algae are different.
2. According to paragraph 1, all of the following are true of ancestral plants EXCEPT
○ They had cellulose-based cell walls.
○ They were closely related to green algae
○ They were able to store nutrients
○ They had a sophisticated multicellular structure.
解析：排除法，A的cellulose based cell walls和C的store nutrients 都可以定位至倒数第二句， 两个选项都正确，不选;B 的green algae 定位至第五句，说陆生植物进化自green algae， 所以选项B正确，不选;D的multicellular structure 与原文第二句的信息相反，错，选; 事实上，这道题根本不需要排除，因为D选项直接跟上题的信息相反。
[1] 植物的进化史是以一系列对周遭环境的适应为标记的。植物的“祖先”是能够进行光合作用的单细胞生物，并由它们进化出那些可能缺少真正的根、茎、叶以及复杂生殖结构——如花朵——的植物。上述提到的这些特征出现于植物进化史的后期。在今天的众多藻类中，绿藻可能与植物的祖先最为相似。这个假说根植于两种物种很近的系统发育(自然进化论)的关系。通过对比两者的DNA，得知绿藻是目前还存活的与植物亲缘关系最近的“近亲”。此外，其他一系列证据支持了这种假说，即陆生植物由原始绿藻进化而成，两者在进行光合作用时使用了相同类型的叶绿素和辅助色素。而红藻和褐藻则并非如此。绿藻以淀粉的形式贮藏能量，这与陆生植物相同;绿藻具有由纤维素构成的细胞壁，这与那些陆生植物的组织结构相同。同样的，红藻和褐藻在能量贮藏形式和细胞壁分子构成方面与之不同。
Paragraph 5:When plants pioneered the land, they faced a range of challenges posed by terrestrial environments. On land, the supportive buoyancy of water is missing, the plant is no longer bathed in a nutrient solution, and air tends to dry things out. These conditions favored the evolution of the structures that support the body, vessels that transport water and nutrients to all parts of plant, and structures that conserve water. The resulting adaptations to dry land include some structural features that arose early in plant evolution; now these features are common to virtually all land plant. They include roots or root like structures, a waxy cuticle that covers the surfaces of leaves and stems and limits the evaporation of water, and pores called stomata in leaves and stems that allow gas exchange but close when water is scarce, thus reducing water loss. Other adaptations occurred later in the transition to terrestrial life and now wide spread but not universal among plants. These include conducting vessels that transport water and minerals upward from the roots and that move the photosynthetic products from the leavesto the rest of the plant body and the stiffening substance lignin, which support the plant body, helping it expose maximum surface area to sunlight.
9. According to paragraph 5, all of the following are problems that early terrestrial plants had to overcome Except
○ a tendency to become dry
○ the inability to limit surface sunlight
○ the absence of a structure to support the body of the plant
○ the inability to transport water and minerals through the plant
解析：A的become dry定位至第二句的 air tends to dry things out，A正确，不选;C的support the body和D的 transport water and minerals定位至第三句，两个答案都正确，不选;B的 sunlight在最后一句，但跟问题问的什么困难根本不是一回事儿，错。
[5] 当植物开拓陆地的时候，它们要面对一系列陆地环境带来的挑战。在陆地上，水中支撑植物的浮力消失，植物不能再漂浮在营养液里，空气会风干水分。这些条件有助于进化出那些用于支撑枝干的结构、运输水分和养分到植物各部分的导管以及储存水分的结构。对干旱陆地的适应结果包括一些在早期植物进化中所体现出的结构特征;现在，这些特征几乎在所有的陆生植物上都有所体现。其中包括根或者类似根的结构、覆盖茎叶表面能阻止水分蒸发的蜡质角质层以及茎叶上被称为气孔的小孔——气孔的存在可以保证气体的交换，并在水分缺失时关闭气孔从而防止水分的进一步流失。其他的适应机制在向陆地过渡过程中出现得较晚，现在体现在很多植物上，但并不是所有的植物。其中包括从根部向上运输水分和矿物质的导管，从叶片向植物其他部分输送光合作用产物的筛管以及用来支撑植物体、使得它以最大表面积接触阳光的硬化木质。
以上就是托福阅读TPO25-3中的否定事实信息题及其解析，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
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