It’s a little surprising that a house made of wood or bamboo may stay up in an earthquake while _______ made of steel and concrete may fall down.

A．one

B．that

C．it

D．what

熟地黄的主治病证是（）。

A.血虚证，出血证

B.血虚证，遗精盗汗证

C.血虚证，胁肋脘腹疼痛

D.血虚证，痈疽疮疡证

E.血虚证，虚劳喘咳证