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(37秒-1分)When Bill Gates says that “Today the greatest risk of global catastrophedoesn';t look like this.Instead, it looks like this.”, “this” here refers to().

(37秒-1分)When Bill Gates says that “Today the greatest risk of global catastrophedoesn';t look like this.Instead, it looks like this.”, “this” here refers to().
A.Avian flu
B.Missiles
C.Microbes
D.Ebola
正确答案:Microbes