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三篇看下来，总体的难度不会很大，3篇文章的题材也都比较典型，考生平时一定要多积累，总结该类题材文章的特点。
第一篇：
题材划分： 建筑类
主要内容：该篇文章主要讲解日本建筑风格及其建造技术的变化。第一段介绍背景，日本的统治者不仅和自己的家族有联系，也和其配偶的家族相关。第二段讲到以前的建筑容易腐蚀，由于当时政治和建筑材料的问题，日本统治者频繁的更换住址，就会继续使用能用的材料，其余的烧掉。第三段提到费时费力，难以把人和物资集中起来，但是由于集权扩大，并且欣赏其他国家，比如中国的建筑，日本统治者需要建立能够居住更久的建筑。所以最后建筑师慢慢的形成了compromise, 既有旧时风格的建筑，又有像宫殿类的建筑出现。
第二篇
题材划分： 天文类
主要内容：该篇文章主要讲解太阳系的起源。大部分科学家认为太阳系是由large nebulous形成的，nebulous大部分是由氢氦，以及其他一些重元素组成的。可能由于5亿年前的supernova产生了shock wave，nebulous形成了温度极高的pre-sun,之后其他星球慢慢形成。文章也提到了inner planets 和outer planets，其中outer planets由于离太阳较远，温度低，有较多的冰。
第三篇
题材划分：生态类
主要内容：讲解太平洋上的两种岛屿，一个是本身就有的，另一个是由于地址形成的，比如火山岛，之后讲解了两个岛屿上的物种多样化，影响岛屿上物种多样化的因素有land size, 经度(越往东，隔离物种越少)，纬度(纬度高的不容易有热带岛屿)，以及风。有些岛屿虽然比较偏远，但是也形成了独特的物种。
第一篇：
题材划分： 建筑类
主要内容：该篇文章主要讲解日本建筑风格及其建造技术的变化。第一段介绍背景，日本的统治者不仅和自己的家族有联系，也和其配偶的家族相关。第二段讲到以前的建筑容易腐蚀，由于当时政治和建筑材料的问题，日本统治者频繁的更换住址，就会继续使用能用的材料，其余的烧掉。第三段提到费时费力，难以把人和物资集中起来，但是由于集权扩大，并且欣赏其他国家，比如中国的建筑，日本统治者需要建立能够居住更久的建筑。所以最后建筑师慢慢的形成了compromise, 既有旧时风格的建筑，又有像宫殿类的建筑出现。
相似TPO练习推荐：
TPO 03：Architecture
相关知识背景：
Japanese architecture has traditionally been typified by wooden structures, elevated slightly off the ground, with tiled or thatched roofs. Sliding doors were used in place of walls, allowing the internal configuration of a space to be customized for different occasions. People usually sat on cushions or otherwise on the floor, traditionally; chairs and high tables were not widely used until the 20th century. Since the 19th century, however, Japan has incorporated much of Western, modern, and post-modern architecture into construction and design, and is today a leader in cutting-edge architectural design and technology.
The earliest Japanese architecture was seen in prehistoric times in simple pit-houses and stores that were adapted to a hunter-gatherer population. Influence from Han Dynasty China via Korea saw the introduction of more complex grain stores and ceremonial burial chambers. The introduction into Japan of Buddhism in the sixth century was a catalyst for large-scale temple building using complicated techniques in wood. Influence from the Chinese T"ang and Sui Dynasties led to the foundation of the first permanent capital in Nara. Its checkerboard street layout used the Chinese capital of Chang"an as a template for its design. A gradual increase in the size of buildings led to standard units of measurement as well as refinements in layout and garden design. The introduction of the tea ceremony emphasised simplicity and modest design as a counterpoint to the excesses of the aristocracy.
During the Meiji Restoration of 1868 the history of Japanese architecture was radically changed by two important events. The first was the Kami and Buddhas Separation Act of 1868, which formally separated Buddhism from Shinto and Buddhist temples from Shinto shrines, breaking an association between the two which had lasted well over a thousand years and causing, directly and indirectly, immense damage to the nation"s architecture.
Second, it was then that Japan underwent a period of intense Westernization in order to compete with other developed countries. Initially architects and styles from abroad were imported to Japan but gradually the country taught its own architects and began to express its own style. Architects returning from study with western architects introduced the International Style of modernism into Japan. However, it was not until after the Second World War that Japanese architects made an impression on the international scene, firstly with the work of architects like Kenzo Tange and then with theoretical movements like Metabolism.
第二篇
题材划分： 天文类
主要内容：该篇文章主要讲解太阳系的起源。大部分科学家认为太阳系是由large nebulous形成的，nebulous大部分是由氢氦，以及其他一些重元素组成的。可能由于5亿年前的supernova产生了shock wave，nebulous形成了温度极高的pre-sun,之后其他星球慢慢形成。文章也提到了inner planets 和outer planets，其中outer planets由于离太阳较远，温度低，有较多的冰。
相似TPO练习推荐：
TPO 22：The Allende Meteorite
相关知识背景：
The Solar System comprises the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets that form the planetary system around it, while the remainder are significantly smaller objects, such as dwarf planets and small Solar System bodies (SSSBs) such as comets and asteroids.
The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system"s mass is in the Sun, with most of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, also called the terrestrial planets, are primarily composed of rock and metal. The four outer planets, the giant planets, are substantially more massive than the terrestrials. The two largest, the gas giants Jupiter and Saturn, are composed mainly of hydrogen and helium; the two outermost planets, the ice giants Uranus and Neptune, are composed largely of substances with relatively high melting points compared with hydrogen and helium, called ices, such as water, ammonia and methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.
The Solar System also contains smaller objects. The asteroid belt, which lies between Mars and Jupiter, mostly contains objects composed, like the terrestrial planets, of rock and metal. Beyond Neptune"s orbit lie the Kuiper belt and scattered disc, populations of trans-Neptunian objects composed mostly of ices, and beyond them a newly discovered population of sednoids. Within these populations are several dozen to possibly tens of thousands of objects large enough to have been rounded by their own gravity. Such objects are categorized as dwarf planets. Identified dwarf planets include the asteroid Ceres and the trans-Neptunian objects Pluto and Eris. In addition to these two regions, various other small-body populations, including comets, centaurs and interplanetary dust, freely travel between regions. Six of the planets, at least three of the dwarf planets, and many of the smaller bodies are orbited by natural satellites, usually termed “moons” after Earth’s Moon. Each of the outer planets is enriched by planetary rings of dust and other small objects.
The solar wind, plasma flowing outwards from the Sun, creates a bubble in the interstellar medium known as the heliosphere. The heliopause is the point at which pressure from the solar wind is equal to the opposing pressure of interstellar wind; it extends out to the edge of the scattered disc. The Ort cloud, which is believed to be the source for long-period comets, may also exist at a distance roughly a thousand times further than the heliosphere. The Solar System is located in the Orion Arm, 26,000 light years from the center of the Milky Way.
第三篇
题材划分：生态类
主要内容：讲解太平洋上的两种岛屿，一个是本身就有的，另一个是由于地址形成的，比如火山岛，之后讲解了两个岛屿上的物种多样化，影响岛屿上物种多样化的因素有land size, 经度(越往东，隔离物种越少)，纬度(纬度高的不容易有热带岛屿)，以及风。有些岛屿虽然比较偏远，但是也形成了独特的物种。
相似TPO练习推荐：
TPO32 Plant Colonization
相关知识背景：
Biodiversity is the variety of different types of life found on earth. It is a measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation, or species variation (number of species) within an area, biome, or planet. Terrestrial biodiversity tends to be highest near the equator, which seems to be the result of the warm climate and high primary productivity. Biodiversity is not distributed evenly on Earth. It is the richest in the tropics. Marine biodiversity tends to be highest along coasts in the Western Pacific, where sea surface temperature is highest and in the mid-latitudinal band in all oceans. There are latitudinal gradients in species diversity. Biodiversity generally tends to cluster in hotspots, and has been increasing through time but will be likely to slow in the future.
Rapid environmental changes typically cause mass extinctions. Although more than 99 percent of all species that ever lived on the planet are estimated to be extinct, there are currently 10–14 million species of life on the Earth.
The period since the emergence of humans has displayed an ongoing biodiversity reduction and an accompanying loss of genetic diversity. Named the Holocene extinction, the reduction is caused primarily by human impacts, particularly habitat destruction. Conversely, biodiversity impacts human health in a number of ways, both positively and negatively.