Chinese culture,has become ________ interest for people all over the world since the Shanghai Expo

and many foreigners are discovering ________ history of China. [ ]

A. the；/  

B. an；the

C. an；/  

D. the；the

仙人掌的叶退化成针状，可以减少体内水分的散失；茎特化为肉质，有利于储存水分。这些特点说明仙人掌适应的环境是                                     （  ）

A．热带雨林

B．干旱沙漠

C．寒冷极地

D．湿地滩涂