We are living in ______ world of developing, ______ world where any problem can be solved in a peaceful way.

A．the; a

B．a; the

C．the; the

D．a; a

因创伤造成的隐裂无牙髓症状时，应首先采用（）

A.降低咬合

B.正畸牵引术

C.药物脱敏

D.覆盖义齿修复

E.夹板固定