42. happened
【解析】 根據(jù)下文in...可知此處應(yīng)該填入一個(gè)動(dòng)詞,表示"發(fā)生"。
43. victim
【解析】 此處應(yīng)該填入一個(gè)名詞被first修飾。
44. The problem was that they had no protective equipment to prevent themselves from being infected
【聽音關(guān)鍵詞】protective equipment,prevent,infected
45. Now the disease appears to be under control, but no one can promise that for 100 percent
【聽音關(guān)鍵詞】disease,under control,promise
46. Scientists are now headed into the jungles of Africa to find out where the virus lives
【聽音關(guān)鍵詞】headed into,jungles,virus
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