【正文】 ，推理，概括和歸納，從而選出正確答案。7．閱讀理解 Durian(榴蓮) is probably the smelliest fruit in the world, letting out an unusual unpleasant smell which would make anyone bring up. However, nobody was aware of what gave this fruit its unique smell, so a team of researchers from Singapore decided to take a look at its genome (基因組) and find out, Durian is wellknown throughout Southeast Asia as the king of fruits, mostly because of its awful appearance and smell. However, the origin of this unpleasant smell was unknown, so researchers decided to map the genome of the fruit, and find the gene that controlled it. A group of genes, volatile sulfur pounds (含硫化合物), became very active in the fruit, and they were found responsible for resulting in the unpleasant smell. The fruit confuses everyone with a sulfuric smell, like rotten onions and ingredients. The smell lasts long, mostly because the fruit contains more volatile sulfur pounds. Other species usually benefit from two gene copies at most, but durian has four, leading to the striking smell. However, this smell might be an advantage for durian in the wild. Although we find it unpleasant, many animals might be attracted by it. If they eat the fruit, then they can easily spread its seeds everywhere, thus contributing to the distribution of the species. The mapping of the durian genome also showed some other information on the species. First of all, the fruit has an impressive number of genes, namely 46,000. Also, with the help of these genes, they saw how it evolved, and discovered it was related to the cacao tree. All the other discoveries have been published in the journal Nature Genetics. Despite the striking smell, many people actually enjoy eating the fruit. However, not all durian species are edible, and some of them may even cause damage to our health, Even so, the fruit is often imported, significantly contributing to the economy.（1）What give durian its unique smell? A.Onions nearby.B.Two gene copies.C.Rotten ingredients in it.D.Volatile sulfur pounds.（2）What does the underlined word “evolved” in Paragraph 5 probably mean? A.Developed.B.Escaped.C.Predicted.D.Tolerated.（3）What can we infer from the text? A.No birds enjoy eating durian.B.Durian can be planted all over the world.C.Some of durian species can not be eaten.D.Durian has no relationship with the cacao tree.（4）What39。s the best title for the text? A.What39。s Durian?B.The Influence of the SmellC.The Distribution of DurianD.The Mystery of the Unpleasant Smell of Durian【答案】（1）D（2）A（3）C（4）D 【解析】【分析】本文是一篇說明文，新加坡的研究者找出導(dǎo)致水果有難聞氣味的原因就是水果中含有的揮發(fā)性硫化合物非常活躍，這種氣味對于野外生存榴蓮來說有利于吸引動物來吃這種水果，同時(shí)傳播種子。(1)考查細(xì)節(jié)理解。根據(jù)第二段中的“so researchers decided to map the genome of the fruit, and find the gene that controlled it. A group of genes, volatile sulfur pounds (含硫化合物), became very active in the fruit, and they were found responsible for resulting in the unpleasant smell.”可知，研究人員找到一組基因——揮發(fā)性硫化合物（SouthType），在水果中非?；钴S，發(fā)現(xiàn)是它們導(dǎo)致了這種難聞的氣味。故選D。(2)考查詞義猜測。根據(jù)倒數(shù)第二段內(nèi)容可知，研究者畫出了榴蓮的基因圖。通過基因圖，發(fā)現(xiàn)了這種水果的基因龐大，有46000條基因。在這些基因的幫助下，他們了解了榴蓮的基因如何演變的，并發(fā)現(xiàn)榴蓮與可可樹有關(guān)。A項(xiàng)develop“使進(jìn)化”，與劃線詞 evolved 是同義詞。故選A。(3)考查推理判斷。根據(jù)最后一段中的“not all durian species are edible, and some of them may even cause to our health,”可知，并不是所有的榴蓮都是能吃的，有些榴蓮是不可以吃的。由此可推斷出選C。(4)考查主旨大意。文章說榴蓮可能是世界上最臭的水果，但沒有人知道原因。新加坡的研究者決定來查明原因。最后通過繪制的榴蓮基因圖發(fā)現(xiàn)了它難聞氣味的原因。由此可知，本文最好的題目應(yīng)該是“榴蓮難聞之謎”最為適合，故選D。【點(diǎn)評】本題考點(diǎn)涉及細(xì)節(jié)理解，推理判斷，詞義猜測和主旨大意四個(gè)題型的考查，是一篇科普類閱讀，要求考生在捕捉細(xì)節(jié)信息的基礎(chǔ)上，進(jìn)一步根據(jù)上下文的邏輯關(guān)系，進(jìn)行分析，推理，概括和歸納，從而選出正確答案。8．閱讀理解 Dodder is an unusual and unwanted plant that attacks other plants. Except for its flowers, the plant looks like spaghetti, a kind of noodles in the shape of long thin pieces that look like string when they are cooked. It39。s almost leafless, threadlike stems hang down on top of other plants that dodder needs to stay alive. Dodder does not produce its own food. Instead, it steals food from other plants. It feeds by sucking juices from the plant which is wrapped around, often making its host very weak or even killing it. Dodder can find other plants by their smell. When a young dodder plant starts growing, it follows the smell of plants it prefers, like tomato plants, potato plants, or other farm crops. Unlike most plants that usually grow in the direction of light or warmth, a dodder plant will grow in the direction of, for example, tomato smell—if a tomato happens to be growing nearby. However, a young dodder plant must find a host plant quickly. It no longer needs its root once it is attached to the host and wrapped around it. If it cannot catch a smell of a potential host within a few days, it will dry up and vanish even if there is plenty of water around. Once it finds a host, the young dodder plant will attach itself to it and start growing faster. At that point the dodder plant will drop its root. Dodder is thus a difficult weed to manage and a real headache for farmers. When it does get out of hand, dodder can greatly reduce a farmer39。s harvest or even destroy crops pletely. Before sowing their produce, especially farmers in warm parts of the world often check to make sure no unwanted dodder seeds have mixed with their crop seeds. This is a good way to stop dodder plants from making their way to a crop field secretly.（1）Why does the author mention spaghetti in the fir