How do scientists estimate the age of language? A．By studying animals' evolution. B．By studying human genes. C．By using mathematical tools. D．By using the age of living species.
A.By B. B．By C. C．By D. D．By E.
【参考答案】
C 细节判断题。听本段新闻时，一定要注意原话的表述内容，不能只凭借只言片语来作答，那样往往会落入出题人的陷阱。新......