．The theory is true _______ the hotter a body is, the more energy it gives off.

A．that

B．when

C． which

D．what

能降低毛细血管通透性，增强毛细血管对损伤的抵抗性的药物是（）

A.槐花

B.艾叶

C.大蓟

D.茜草

E.蒲黄