Đáp án đề 405:
Lotus silk is one of the rarest fabrics in the world, produced only in small scale across Cambodia, Myanmar, and, more recently, Vietnam. This natural fiber is only extracted by a few skilled craftspeople across the world. But making this silk isn't easy. Extracting enough lotus silk for one scarf can take two months, and the final product can cost 10 times as much as regular silk. So just how is it made, and what makes it so expensive? Phan Thi Thuan's family have been making silk for generations, growing and harvesting the threads from silkworms themselves to create luxury garments. But making lotus silk is different. Silk usually comes from silkworms. They're kept on wide trays and need to be fed almost 24 hours a day with mulberry leaves. The caterpillars delicately spin threads to create their cocoons, and it can take hundreds of silkworms to make a kilo of silk.
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