Tom was playing computer games all night.________he was late for class. [ ]

A. That's because  

B. That's why

C. It's how  

D. That's how

某县教育局根据中考成绩，将全县初级中学分为普通初中和实验初中，并对后者从师资、经费等发面予以倾斜，该县义务教育没有做到（ ）。

A．重点发展

B．均衡发展

C．协调发展

D．优先发展