哪个小女孩是她们的妹妹？
我又问她们：那谁是妹妹啊？[{'character': '我', 'pinyin': 'uo3', 'highest pitch': 8.8, 'lowest pitch': 7.94, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '又', 'pinyin': 'iou4', 'highest pitch': 11.44, 'lowest pitch': 8.37, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '问', 'pinyin': 'uen4', 'highest pitch': 10.19, 'lowest pitch': 8.21, 'duration': 0.22, 'prosody hierarchy': '#1'}, {'character': '她', 'pinyin': 'ta1', 'highest pitch': 8.76, 'lowest pitch': 7.89, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '们', 'pinyin': 'men5', 'highest pitch': 7.92, 'lowest pitch': 6.22, 'duration': 0.27, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.18}, {'character': '那', 'pinyin': 'na4', 'highest pitch': 10.35, 'lowest pitch': 9.76, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '谁', 'pinyin': 'shuei2', 'highest pitch': 9.77, 'lowest pitch': 6.48, 'duration': 0.26, 'prosody hierarchy': '#1'}, {'character': '是', 'pinyin': 'shiii4', 'highest pitch': 10.92, 'lowest pitch': 8.63, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '妹', 'pinyin': 'mei4', 'highest pitch': 11.55, 'lowest pitch': 10.35, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '妹', 'pinyin': 'mei5', 'highest pitch': 10.35, 'lowest pitch': 6.65, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '啊', 'pinyin': 'a5', 'highest pitch': 6.65, 'lowest pitch': 5.51, 'duration': 0.3, 'prosody hierarchy': '#4'}]