A、<p><span style="font-size: 10.5pt; font-family: 宋体;">口腔</span></p>
B、<p><span style="font-size: 10.5pt; font-family: 宋体;">胃</span></p>
C、<p><span style="font-size: 10.5pt; font-family: 宋体;">小肠</span></p>
D、<p><span style="font-size: 10.5pt; font-family: 宋体;">大肠</span></p>
E、<p><span style="font-size: 10.5pt; font-family: 宋体;">直肠</span></p>