The 20th-century poem suggests to something we have been able to find nothing about.

A．alludes

B．avoids

C．alleges

D．alerts

有关继发性甲减的描述，正确的是（）

A.以上都对

B.由甲状腺肿瘤引起的甲减，称继发性甲减

C.手术后甲减，称继发性甲减

D.由于下丘脑疾病引起的TRH分泌减少，称继发性甲减

E.由于垂体疾病引起的TRH分泌减少，称继发性甲减