---Warren Buffett is the second wealthiest man in the world .

---He is, but___ doesn’t follow that he lives the most expensive life. Actually, he still lives in an old house that he bought 30 years ago.

A．that

B．it

C．everyone

D．anyone

尽量减低对受试者的身体伤害（包括疼痛和痛苦、残疾和死亡）、精神伤害和经济损失，尽量少对人群的公共卫生风险或危险、以及对生态环境的危害等。这是（）的基本要求。

A.不伤害原则

B.尊重原则

C.公正原则

D.有利原则