Merge pull request #11 from ProgrammerYuan/master

修改答完题集后报错Bug
Merge pull request #14 from ProgrammerYuan/master

“关于我们”页面内容及配图修改 Version 2
修改答题逻辑
修改随机答题实现
Merge remote-tracking branch 'origin/master'
Merge pull request #16 from Surlavi/master

修改答题逻辑 & 随机答题实现
Merge pull request #15 from ProgrammerYuan/master

“关于我们”页面内容及配图修改-Modify Last Sentence 2
Merge pull request #17 from ProgrammerYuan/master

关于我们页面修改2
Merge pull request #2 from xtdz/master

merge from master