A．having maintained good relations with other people

B．being patient enough

C．keeping secrets

D．being undetermined sometimes

促胰液素和促甲状腺激素的靶细胞分别是（）

A.小肠黏膜细胞和甲状腺细胞

B.胰腺细胞和甲状腺细胞

C.肝细胞和下丘脑细胞

D.胰岛细胞和垂体细胞