阅读下面短文，从每题所给的A、B、C、D四个选项中选出最佳选项。16．（15分）ㅤI've been motivated﹣﹣and demotivated﹣﹣by other folks' achievement s all my life. ㅤWhen I was a teenager，a neighborhood friend（12） by about 100"local"bikers who were used to such roads.When I got back home，suddenly riding my bike didn't seem quite as
