He is young he knows a lot about Chinese geography.A. butB. andC. soD. or

问题补充：

He is young, he knows a lot about Chinese geography.

A. but

B. and

C. so

D. or

答案：

(答案→)A. but

B. and

C. so

D. or

解析：本题前句表示他很年轻，后句却表示他了解很多的中国地理，表示的是意思的转折，用but，故本题选D。