生态平衡依赖于生态系统的自我调节能力。下列生态系统调节能力最强的是 [ ]
A.农田生态系统
B.池塘生态系统
C.草原生态系统
D.森林生态系统
D
When he came back, he found the bag he had ______________ over the seat was gone.
A.left hanging
B.left to hang
C.left hung
D.to leave hanging
某患者的检查结果为TT3升高,TT4升高,TSH下降,该患者最可能的疾病是
A.原发性甲状腺功能低下
B.继发性甲状腺功能低下
C.原发性甲状腺功能亢进
D.继发性甲状腺功能亢进
E.甲状旁腺切除