第4题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard. A. A.Individual humans share 90 percent of their DN B. B.Individual humans share 99.9 percent of their DN C. C.Individual humans share 99 percent of their DN 参考答案:B 答案解析:[听力原文] Q: How similar are human genes [一点即通] 女士问我们彼此之间的基因有多么相似,男士说人类个体彼此非常相似,不论种族,人类99.9%的基因