If a teacher attempts to implement the bottom-up model to teach listening, he/she is likely to present______.
If a teacher attempts to implement the bottom-up model to teach listening, he/she is likely to present______.
男性,53岁,近1个月来大便次数增多,有肛门坠胀感及里急后重,大便变细,常有黏液血便,经抗生素治疗症状可缓解。但不久又复发,且呈进行性加重。
首先应进行的检查是