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第1题、In December 2019, a cluster of pneumonia cases were found. Scientists believe that It was caused by a previously unknown virus- Now named COVID-19.     Coronaviruses have the appearance of a crown. Crown in Latin is called "corona" and that´s how these viruses got their name. There are different types of coronaviruses that cause respiratory and sometimes gastrointestinal of symptoms.     It´s known that coronaviruses circulate in a range of animals. But the animals which transmit COVID-19 are not known yet. And the exact dynamics of how the virus is transmitted is yet to be determined.     From what is known so far, there can be a number of ……此处隐藏6887个字…… it in production practice, which actually solved the problem of Chinese people´s difficulty in eating. Yuan Longping has also been to the United States, India and other countries for many times to teach technology, giving lectures to government officials and scientific researchers in more than 30 countries and regions, and promoting hybrid rice technology to benefit the world.     On November 3, 1987, UNESCO presented Yuan Longping with a science award at its headquarters in Paris, believing that his scientific research achievements were "the second Green Revolution". In 2004, Yuan Longping won the World Food Prize for his outstanding contribution to providing nutritious and abundant food for mankind.