Neither its cause ____56____ was understood. So many thousands of terrified people died every time _

填写课文背诵段落中所缺的词语，每空一词或多词。
Neither its cause ____56____ was understood. So many thousands of terrified people died every time ____57____.
He knew that cholera_____58_____ until its cause was found.
Now when people ____59____England you will find Wales ___60___ as well.
【答案】56. nor its cure    
57. there was an outbreak    
58. would never be controlled    
59. refer to    
60. included
【解析】