More and more students _________ too much homework and they are really tired of it.

A．complain about

B．care about

C．learn about

D．hear about

对诊断甲状腺功能亢进有较高的敏感性的指标是

A．T₁

B．T₂

C．T₃

D．T₄

E．摄¹³¹I率的测定