绒毛膜癌与侵蚀性葡萄胎的区别在于侵蚀性葡萄胎能见到( ),而绒毛膜癌则失去( )。
参考答案:完整的绒毛结构或葡萄样组织 绒毛结构
For the young, ______ should be showed to their parents, teachers and old people.
A.respect
B.seriousness
C.laugh
D.laziness
裁判长的职责是什么?