You ______a teacher. I ______ a student. My sister ______a student, too.
A:am; is; are
B:is; are; am
C:are; am; is
D:are; is; is
在公民的人身权中最根本的是( )
生态系统之所以能维持相对稳定,是由于生态系统具有____能力,该能力的基础是____ .