I plan to go back home to visit my family during the Spring Festival, but if I can't get the train ticket,

I still have an________ plan: to visit the museums. [ ]

A. alternate      

B. alternative  

C. absolute      

D. appreciable

中华人民共和国环境保护法的立法目的是为了改善( )。

A．生活环境和生态环境

B．生活环境和治安环境

C．生活环境和文化环境

D．社会环境和生活环境