Have you decided where to spend your summer holiday?

---Not yet.We       go to Qingdao.

A．must

B．should

C．need

D．may

具有促蛋白质合成代谢作用的激素包括()

A．生长激素

B．胰岛素

C．糖皮质激素

D．雄激素

E．甲状腺激素