add two question indexs plot

eda/ml_tools/rate.csv

-date,answer_imp_all,answer_imp_ios,answer_imp_android,diary_imp_all,diary_imp_ios,diary_imp_android,activate_uid_ctr_all,activate_uid_ctr_ios,activate_uid_ctr_android,activate_uid_ave_imp_all,activate_uid_ave_imp_beijing,click_answer_uid_all,click_answer_uid_ios,click_answer_uid_android,click_diary_uid_all,click_diary_uid_ios,click_diary_uid_android,click_one_uid_all,click_one_uid_ios,click_one_uid_android
+date,answer_imp_all,answer_imp_ios,answer_imp_android,diary_imp_all,diary_imp_ios,diary_imp_android,activate_uid_ctr_all,activate_uid_ctr_ios,activate_uid_ctr_android,activate_uid_ave_imp_all,activate_uid_ave_imp_beijing,click_answer_uid_all,click_answer_uid_ios,click_answer_uid_android,click_diary_uid_all,click_diary_uid_ios,click_diary_uid_android,click_one_uid_all,click_one_uid_ios,click_one_uid_android,question_imp_all,question_imp_ios,question_imp_android,click_question_uid_all,click_question_uid_ios,click_question_uid_android
 20180817,0.0401,0.0569,0.0336,0.7272,0.8801,0.6678,0.0403,0.0624,0.0269,59.93,92.74,0.0189,0.0178,0.02,0.1094,0.1391,0.0852,0.1242,0.1537,0.1
 20180818,0.0383,0.0526,0.0331,0.7134,0.8665,0.658,0.0414,0.065,0.0267,57.73,78.98,0.0153,0.0167,0.0139,0.1052,0.1397,0.0786,0.1227,0.1572,0.0972
 20180819,0.0393,0.0538,0.0337,0.7211,0.8763,0.6605,0.0468,0.0726,0.0293,51.29,73.27,0.0175,0.0212,0.0136,0.1115,0.1442,0.085,0.1283,0.1598,0.1027