古代哲学中，气的概念源自于（）
A.阴阳说
B.水地说
C.五行说
D.元气说
E.云气说
参考答案：E
He was very sad to think that he her so much pain. [ ]
A. considered
B. offered
C. caused
D. produced
粪便呈持续细条状常见于（）
A.消化不良
B.细菌性痢疾
C.便秘
D.痔疮
E.直肠癌
