腹部不适，无力，消瘦，发热伴贫血，粪便带脓血或粘液（）
A．左半结肠癌
B．右半结肠癌
C．小肠肿瘤
D．溃疡性结肠炎
参考答案：B
Great changes ________ in that school. It is no longer _______ it was 20 years ago.
A．have taken place, that
B．have been taken place, what
C．have taken place, what
D．took place, the place what
某一中药水溶液具有发泡性和溶血性原因可能是含有哪类成分所致（）
A．环烯醚萜
B．二葸酮
C．黄烷醇
D．木脂素
E．皂苷
