--- What’s your brother?

---He _______ a teacher, but now he is a doctor.

A．used to be

B．was used to

C．use to be

D．is used to be

甲状腺激素促进机体生长发育的部位是

A．骨骼肌和心肌
B．神经系统和骨骼肌
C．神经系统和骨骼
D．骨骼和肌肉
E．内脏和骨骼肌