article: The weather is getting warmer and warmer. It is fun to play outside, but people are afraid to play outside these days, because of the H7N9 virus. The H7N9 virus is one type of influenza A H7 viruses. It is a new type of bird flu. Influenza A H7 viruses mainly affectbirds but sometimes they can also affect humans. Most people infected with H7N9 virus look like they had a common flu. They had a fever, a cough and shortness of breath. Some had bad pneumonia. This March, H7N9 virus hit Shanghai, Anhui, Jiangsu and Zhejiang. Up until April 11th, the number of people infected had reached 35. Nine of these people died.
  But don't be afraid , some cases are curable. A 4-year-old boy in Shanghai and a 67-year-old man in Hangzhou got the virus, and they are getting better. Besides, it's not easy to be infected by the H7N9 virus.
  There are some ways to save ourselves from this. First, wash your hands with soap and running water before you eat and after you use the toilet. You should do the same after you touch animals or animal waste. Second, cover your nose and mouth with your elbow when coughing. Third, you should have a good rest and do some exercises, so your body can become strong enough to beat the virus.
question: Which place didn't find H7N9 in March?
options: Shanghai Jiangsu Zhejiang Beijing