It is a race against time, Smith said, because in the last decade alone, 20 plants held in the bank have already been wiped out in the wild. He estimates that between a third and a quarter will become extinct this century.

　　"It is urgent and it is happening now. An area, the size of England, is cleared of primary vegetation（植被）every year." Smith said.

　　Because most of the world's food and medicines come from nature, protecting wild plant species is quite important, scientists say. There are already many other seed banks safeguarding food crops, which only account for 0.6 percent of plant diversity.

　　For Kew's next goal—to collect a quarter of wild varieties by 2020—the botanists need 10 million pounds a year, or a further 100 million pounds on top of the 40 million they have already been granted.

　　56. What’s the final purpose of the Britain’s seed bank?

　　A. To collect enough money for the project.

　　B. To safeguard food crops.

　　C. To protect wild plants from extinction.

　　D. To help scientists study wild plants.

　　57. The wild banana seed in China is in danger because of _______.

　　A. the expanding of farming work

　　B. the climate change in this area

　　C. the large number of Asian elephants

　　D. human’s large consumption

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