公安机关是刑事诉讼中的审查机关。( )
参考答案：错
解析：公安机关是刑事诉讼中的侦查机关和刑罚执行机关。
---What does Tom’s uncle do?
---He is a teacher. He __________ physics at a school now. [ ]
A. will teach
B. has taught
C. teaches
D. taught
简述导致单通的原因及单通的分析优化方法。
