Many of those who died had other conditions such as hypertension, diabetes, or cardiovascular disease that impaired their __36__ systems. The protocols to prevent infection vary from person to person,depending on the likelihood of vunerable individuals making contact. Official advice has generally been limited to calls for good personal __37__. Standard recommendations to prevent infection spread include regular hand washing, covering mouth and nose when coughing and sneezing, cooking meat and eggs__38__.
      Several organizations around the world are developing vaccines or testing antiviral medicine. In China,
the Chinese Center for Disease Control and Prevention (CCDC) has started developing vaccines __39__ the novel coronavirus and is testing existing drug effectiveness for pneumonia. In Western countries, the United States' National Institutes of Health (NIH) is hoping for __40__ trials of a vaccine by April 2020.
(Retrieved and adapted Feb. 4, 2020, from Wikipedia)
【題組】36.
(A) digestive
(B) biological
(C) reproductive
(D) immune