在托福考试时，做托福阅读的时候，如果能够对背景知识有所了解和熟知，相信对做题很有帮助。下面由北京新航道托福频道小编和大家分享一些托福背景的知识，第二篇是the code of Hammurabi，一起去看看吧。关于the code of Hammurabi大家都有多少了解呢。

　　the code of Hammurabi

　　Hammurabi was the ruler who chiefly established the greatness of Babylon, the world's first metropolis. Many relics of Hammurabi's reign ([1795-1750 BC]) have been preserved, and today we can study this remarkable King....as a wise law-giver in his celebrated code. . .

　　by far the most remarkable of the Hammurabi records is his code of laws, the earliest-known example of a ruler proclaiming publicly to his people an entire body of laws, arranged in orderly groups, so that all men might read and know what was required of them. The code was carved upon a black stone monument, eight feet high, and clearly intended to be reared in public view. This noted stone was found in the year 1901, not in Babylon, but in a city of the Persian mountains, to which some later conqueror must have carried it in triumph. It begins and ends with addresses to the gods. Even a law code was in those days regarded as a subject for prayer, though the prayers here are chiefly cursings of whoever shall neglect or destroy the law.

　　Yet even with this earliest set of laws, as with most things Babylonian, we find ourselves dealing with the end of things rather than the beginnings. Hammurabi's code was not really the earliest. The preceding sets of laws have disappeared, but we have found several traces of them, and Hammurabi's own code clearly implies their existence. He is but reorganizing a legal system long established.

　　Plant adaptation to the desert(背景材料)

　　Cactus adaptations.

　　The secret to the superior endurance of cacti lies in their adaptations. Over millions of years, through natural selection, only the strongest and best adapted species survived.

　　As you know, it is very dry in the desert. Plants that adapt to this are known as xerophytes (from xeros, dry and phyton, plant). There are plants that avoid the dry season by sprouting from seed just after the spring rain and growing very fast so that by the time the dry season comes, they have already produced a lot of seeds and died. These seeds lie on the soil for the dry season and sprout again in spring and the cycle repeats.来源：北京新航道托福培训 Other xerophytes simply drop their leaves and stay dormant for the winter. But there is another special type of xerophyte which stores water in its fleshy tissues. Such plants are called succulents (from succus, juicy). The cactus is a typical example of a succulent.

　　If you cut a cactus open, you see a juicy, slimy tissue. This is where the moisture is stored for the dry season. The part between the middle circle (or pith) and just under the very green part of the plant (or palisade parenchyma) just under the skin is allocated for the storage of water and food for the plant. This is a type of spongy parenchyma and can take up up to 85% of the plant's volume. This is a major adaptation in the desert. Because the plant remains completely alive during the dry season and there is no need for it to dry up and lose everything, makes it possible for the plant to grow to large sizes. Another advantage is that the plant retains supplies (in the form of starch) for the winter so that it can flower right away in spring without accumulating more supplies (as most plants need to do in spring). The whole purpose of storing supplies for the winter is mostly to energize flowering in spring but it also lets the cactus start growing much sooner.

　　Flowering plants breathe and transpire (evaporate water from their surface) through closeable microscopic pores called stomates on the leaves or stems. To do this, their pores have to be open. In most plants these are open all day and on warm nights. But for cacti this is inconvenient as in daytime it is very hot and thus the plant would lose a lot of water through evaporation. So the cactus must close them in the daytime. But then it cannot breathe or photosynthesize (the process where sugars are made from carbon dioxide and water and releasing oxygen using the sun's energy). Succulents have an adaptation to that. Their stomates are closed during the day and are open at night, when it is not that hot and store carbon dioxide in its tissues as crassulean acid and then turn it back to carbon dioxide in the daytime. This process is called crassulean acid metabolism or CAM and it is a very smart way of respiring in the desert.

　　If we look at the outside of the plant, we notice that there is a tough leathery skin covering the plant, we can also notice the presence of ribs and spines and sometimes fur. These are all very smart adaptations. They serve mainly for surviving heat but are also used as defense.

　　相信上面大家都了解了the code of Hammurabi吧。多扩展一些知识对托福阅读来说是十分有必要的。有机会大家就多看看吧。知识需要大家在日常备考的过程中多积累，多练习。熟记涉及到的词汇及句型，了解其考试出题点，尽量减少在托福考场上的思考时间。达到效率高，准确率高的目的。祝大家托福考试顺利。

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