“实践是知识的母亲，知识是生活的灯塔。”这一谚语的哲学寓意是[     ]

A．实践是主观见之于客观的活动    

B．实践是人的能动性的活动    

C．实践是认识的基础，认识影响着实践    

D．认识的根本目的是把认识应用于实践

Tourists often surprised at ______ so many flat and good roads in the mountainous regions.
A) there are C) there to be
B) there being D) there were