【单选题】听力原文: During the past decade there has been a multifold increase in violent crimes throughout the world. Not only has there been a frightening increase of murders and rapes, but chanced of being attac...
【简答题】In the past decade the popularity of rock climbing has greatly increased, and so has the number of injuries. It has been estimated that rock climbing is now enjoyed by more than 9 million people in th...