分析沟通障碍的主要缘故原由有（）
A、个人缘故原由
B、人际缘故原由
C、组织缘故原由
D、环境缘故原由
参考答案：A, B, C
The book, ____ are true stories about great scientists of the 20th century, is well worth reading. [ ]
A. which
B. what
C. in which
D. of which
完形训练
