By analysing the genes of centenarians, scientists found that
A．environment and lifestyle. contribute much to longevity.
B．centenarians' genes are the same as other people.
C．many genetic variants may identify centenarians.
D．19 genetic profiles of centenarians are different from others.

A.environment
B.
B．centenarians'
C.
C．many
D.
D．19
E.


【参考答案】

C
细节理解题。第一段④句讲到，科学家发现某些基因变异体能够在某种程度上鉴别特别长寿者，故C项与之相符。