简述国际法的渊源及其新发展。
参考答案：
对急性肝炎的描述哪些错误
A.肝脏增大，形态饱满
B.肝实质回声增强，光点粗大
C.胆囊缩小，壁厚或有囊内光点回声
D.肝实质回声减低，后方回声轻度增强
E.肝角变钝，表面光滑
The students often _______ their teachers' advice on learning English.[ ]
A. benefit
B. benefit from
C. are of benefit to
D. have the benefit from
