共和的基本原则是（）
A.天下为公
B.国家权力和财富共有
C.民主宪政
D.自由平等
E..人们以和平的方式参与和处理公共事务
参考答案：A, B, E
----It is ______ that self-protection education is required at school.
----I agree. We always have a large course ______ months.
A．certainly; every a few
B．certain; every few
C．sure; every a few
D．surely; every few
直肠癌中预后最差的是
A．恶性黑色素瘤B．未分化癌C．腺癌D．粘液癌E．鳞状细胞癌
