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What is a coronavirus?
     Coronaviruses are a large family of viruses   32.     may cause illness in animals or humans. In humans, several coronaviruses are known to cause respiratory infections ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS). The most recently discovered coronavirus causes coronavirus disease COVID-19.
 What is COVID-19?
     COVID-19 is the infectious disease caused by the most recently discovered coronavirus. This new virus and disease were unknown   33.     the outbreak began in Wuhan, China, in December 2019.
 What are the symptoms of COVID-19?
      The most common symptoms of COVID-19 are fever, tiredness, and dry cough. Some patients may have aches and pains, nasal congestion, runny nose, sore throat or diarrhea. These symptoms are usually mild and begin gradually. Some people become infected but don’t develop any symptoms and don't feel unwell. Most people (about 80%) recover from the disease without needing special treatment. Around 1 out of every 6 people who gets COVID-19 becomes seriously ill and develops difficulty breathing. Older people, and those with underlying medical problems like high blood pressure, heart problems or diabetes, are more likely to develop serious illness. People with fever, cough and difficulty breathing should seek medical attention.
 coronavirus冠狀病毒 virus病毒 human人類respiratory呼吸的 infection感染severe嚴重的 syndrome併發症狀 outbreak爆發patient病人 nasal congestion鼻充血 diarrhea腹瀉gradually逐漸地 develop發展 treatment治療underlying潛在的 diabetes糖尿病
【題組】32.
(A) who
(B) when
(C) which
(D) what