题型:阅读理解 题类:模拟题 难易度:普通
黑龙江省齐齐哈尔市2018届高三英语第三次模拟考试试卷
Durian(榴莲) 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 (基因组) and find out,
Durian is well-known 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 compounds (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 compounds. 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.
There's so much to see and do in the coolest little capital. Here's our list of the top 5 must dos when you visit Wellington.
| Enjoy 360° views from the top of Mount Victoria Get a full view of the city and a great photo at the Mount Victoria Lookout. Watch the ships sailing in and plane taking off from Wellington Airport. |
| Ride the historic Wellington Cable Car The Cable Car is a Wellington mark. It runs from Lambton Quay up to Kelburn. At its top, there's a lookout, the Cable Car Museum, and Space Place at Carter Observatory. |
| Check out our world famous movie-making magic Get into the imagination and the skills of artists behind some of the world's most wonderful movies at the Weta Cave mini-museum, where you can find yourself in the world of the movie— The Lord of the Rings. |
| Have a close touch at Wellington Zoo Do you want to hand-feed a giraffe, play with a group of meerkats (猫鼬) or touch a cheetah's (猜豹) fur? All are possible at Wellington Zoo, the best little zoo in the world. |
| Discover our stories at Te Papa The national museum of New Zealand, Te Papa, is fascinating and fun for any age. The exhibits (展览) tell stories about each side of New Zealand in new and exciting ways. By the way, you can enter the Te papa museum for free. |
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