Culture shock is a feeling____ most travellers experience in a foreign country____ they find the culture is quite different from that of their own.

A．that; which

B．which; that

C．which; where

D．when; where

干燥失重测定法是测定（）

A．不溶性杂质

B．遇硫酸易炭化的杂质

C．水分及其他挥发性物质

D．有色杂质

E．硫酸盐杂质