这个选拔考试是不是非常具有挑战性？
选拔考试门槛高、内容难。[{'character': '选', 'pinyin': 'xvan3', 'highest pitch': 8.95, 'lowest pitch': 7.7, 'duration': 0.29, 'prosody hierarchy': 'null'}, {'character': '拔', 'pinyin': 'ba2', 'highest pitch': 10.94, 'lowest pitch': 8.5, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '考', 'pinyin': 'kao3', 'highest pitch': 10.91, 'lowest pitch': 5.95, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '试', 'pinyin': 'shiii4', 'highest pitch': 8.13, 'lowest pitch': 7.32, 'duration': 0.25, 'prosody hierarchy': '#2'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.05}, {'character': '门', 'pinyin': 'men2', 'highest pitch': 10.67, 'lowest pitch': 7.33, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '槛', 'pinyin': 'kan3', 'highest pitch': 2.89, 'lowest pitch': 2.89, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '高', 'pinyin': 'gao1', 'highest pitch': 9.87, 'lowest pitch': 7.53, 'duration': 0.29, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.12}, {'character': '内', 'pinyin': 'nei4', 'highest pitch': 10.93, 'lowest pitch': 8.84, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '容', 'pinyin': 'rong2', 'highest pitch': 8.84, 'lowest pitch': 7.56, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '难', 'pinyin': 'nan2', 'highest pitch': 9.26, 'lowest pitch': 5.33, 'duration': 0.33, 'prosody hierarchy': '#4'}]