这种物质真的很危险吗？
国际癌症研究中心已将其列为人类一级致癌物。[{'character': '国', 'pinyin': 'guo2', 'highest pitch': 10.44, 'lowest pitch': 8.63, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '际', 'pinyin': 'ji4', 'highest pitch': 10.5, 'lowest pitch': 9.24, 'duration': 0.24, 'prosody hierarchy': '#1'}, {'character': '癌', 'pinyin': 'ai2', 'highest pitch': 9.3, 'lowest pitch': 7.74, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '症', 'pinyin': 'zheng4', 'highest pitch': 11.07, 'lowest pitch': 8.82, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '研', 'pinyin': 'ian2', 'highest pitch': 8.82, 'lowest pitch': 7.33, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '究', 'pinyin': 'jiou1', 'highest pitch': 9.18, 'lowest pitch': 7.57, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '中', 'pinyin': 'zhong1', 'highest pitch': 9.86, 'lowest pitch': 8.47, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '心', 'pinyin': 'xin1', 'highest pitch': 10.24, 'lowest pitch': 9.86, 'duration': 0.31, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.15}, {'character': '已', 'pinyin': 'i3', 'highest pitch': 8.24, 'lowest pitch': 6.07, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '将', 'pinyin': 'jiang1', 'highest pitch': 8.87, 'lowest pitch': 6.08, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '其', 'pinyin': 'qi2', 'highest pitch': 8.82, 'lowest pitch': 7.1, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '列', 'pinyin': 'lie4', 'highest pitch': 8.5, 'lowest pitch': 6.6, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '为', 'pinyin': 'uei2', 'highest pitch': 8.04, 'lowest pitch': 6.18, 'duration': 0.26, 'prosody hierarchy': '#2'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.04}, {'character': '人', 'pinyin': 'ren2', 'highest pitch': 8.26, 'lowest pitch': 6.76, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '类', 'pinyin': 'lei4', 'highest pitch': 8.96, 'lowest pitch': 7.48, 'duration': 0.26, 'prosody hierarchy': '#1'}, {'character': '一', 'pinyin': 'i1', 'highest pitch': 11.04, 'lowest pitch': 8.49, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '级', 'pinyin': 'ji2', 'highest pitch': 7.4, 'lowest pitch': 6.09, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '致', 'pinyin': 'zhiii4', 'highest pitch': 7.73, 'lowest pitch': 6.09, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '癌', 'pinyin': 'ai2', 'highest pitch': 9.3, 'lowest pitch': 5.74, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '物', 'pinyin': 'u4', 'highest pitch': 9.02, 'lowest pitch': 6.96, 'duration': 0.26, 'prosody hierarchy': '#4'}]