题目

56．If you are interested in rock formations, which activities are the best choices?        A．Caves and Fossils．                    B．Fossils and Manners．        C．Caves, and Exploring Caves．            D．Exploring Caves and Manners． 57．If you are members' friends, what benefits can you receive?        A．Two free lectures every month．        B．A membership card and certificate．        C．Favourable price for Youth Camp．        D．Two free tickets to Echo Cove Cave． 58．The purpose of t利用等式的性质解方程：2+4=10；