评价儿童或青少年生长发育较常用的方法是（）

A.指数法

B.离差法

C.相关法

D.发育年龄评定法

E.功能测量法

— It's ______ that you are tired. You should have a rest.

— Thanks, maybe you are right.

[      ]

A. evident

B. easy

C. simple

D. usual