果酱样便可见于：
A．上消化道出血
B．胆道阻塞
C．细菌性痢疾
D．阿米巴痢疾
E．直肠息肉
参考答案：D
A scientific study of language is based on what the linguist thinks.
边缘性龈炎的表现有
A．龈沟探诊无出血B．牙槽骨吸收C．牙龈质韧D．龈缘菲薄E．龈缘色红
