A. People are fairly interested in climbing nowadays.B. It is impossible to build up one’s body by climbing.C. People can only learn the skill of climbing outdoors.D. It is always easy to see holding places in climbing.52. The most difficult thing to do in wall climbing is . A. to tie ropes to your harness B. to control your fearC. to move away from the wall D. to climb straight up53. The underlined word “workout” in the last paragraph most probably means “ ”. A. settlement B. exercise C. excitement D. tiredness54. Why does the author write this passage?A. To tell people where to find gyms.B. To prove the basic need for climbing.C. To encourage people to climb mountains.D. To introduce the sport of wall climbing.