Comprehenslon: Read the passage carefully and answer the question that follows it.
In 1973 a Japanese sericulturist arrived Malawi with a batch of 40,000 sllkworms eggs. They were taken on the.Bvumbwe Agriculture Research Station in Thyolo District. In this station, work is being done to determine favourable silkworm rearing conditions and areas where mulberry trees, whose leaves the worms feed on, could grow well.
According to researchers, the sllk worms which eventually develop into cocoons from which raw sllk is produced do well in areas with climatic condition's. SIlk is one of the strongest of fibres. In fact, for thousands of years, silk fabrics have been regarded as the most beautiful and durable materials woven by man.
Many people call silk the cloth of kings and queens. The weaving of silk originated in China, an old Chinese book, believed to be written by Confucius, tell us that the wife of Emperor Huang-it was the first person to make fabrics of silk. Around 2640 B.C., Emperor took some of the cocoons into the palace to see what they were made of. She dropped one and saw a cobweb like tangle separate itself from the cocoon.
She picked up the gauzy mass and found that one of the threads could be unwound almost - without end from the cocoon. His ling-shih had discovered silk. She was delighted with me discovery and even wove a ceremonial robe for the Emperor out of the cocoon threads. After that, the officials in the Emperor's court wore brightly dyed silk robes on important occasion occasions. People in other countries regarded the new fibres as something rare and beautiful.
A few traders went to China to learn about making cloth from silk, but the Chinese kept their silk worms a closely guarded secret.
Choose the meaning which best fits the underline phrase from the passage closely guarded secret
A. Careful hidden from the knowledge of others B. secretly processed business with armed guards C. carefully hidden from the vlew of strangers D. scarcely known E. unknown
