(37秒-1分）When Bill Gates says that “Today the greatest risk of global catastrophe?doesn’t look like this.?Instead, it looks like this.”, “this” here refers to ___________. A.Avian flu B.Microbes C.Missiles D.Ebola

(37秒-1分）When Bill Gates says that “Today the greatest risk of global catastrophe?doesn’t look like this.?Instead, it looks like this.”, “this” here refers to ___________. A.Avian flu B.Microbes C.Missiles D.Ebola

正确答案：B