题型：任务型阅读 题类：常考题 难易度：普通
浙江省台州市天台中学2019-2020学年高二下学期英语3月月考试卷（含听力音频）
Next time your plane lands, listen to the sound of the tyres hitting the ground. The tyres of cars, motorbikes and trucks are also often made of the same stuff.
Workers cut the trunks of the trees and collect a white liquid called latex（乳胶）. In the nineteenth and early twentieth centuries, huge numbers of rubber trees were planted in countries including Malaysia, Burma and Brazil. Nearly half the rubber which is produced each year is natural rubber and there is always a need for more.
Rubber trees are not easy to grow. Some trees survive while others die and it is all decided by their genes. British scientists have been working together to look at rubber trees. They have now discovered the "genome" (基因组) of the rubber tree. The genome contains all the information the plant or animal needs to grow. The genome for a plant such as a rubber tree is smaller than a human genome but it is still very long, which is why it has been so difficult to find. Scientists say the work has been like putting a picture puzzle together where all the pieces show blue sea and blue sky.
Now scientists can use the rubber tree genome to produce stronger trees. By understanding the genome, they can change the DNA in rubber trees in useful ways.
A. Natural rubber comes from trees.
B. Regretfully, many forests are being severely destroyed.
C. This is the way genes fit together in very long chains of DNA
D. Stronger trees have played a more important role in producing tyres.
E. They are affected by changes in temperature, rainfalls, winds and diseases.
F. The reason why the tyres don't explode is that they are made of natural rubber.
G. In the future, it will be possible to grow trees which survive climate change and disease.
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