修改【20141208】——understand_conis
修改【20141212】——number_sequence_within_ten
修改【20141212】——number_sequence_within_ten
1014 from Sunrise
修改[20141224] by Ruby
1014 from Sumrise
by Sunrise on 11/7
add 5 revised exercises from sunrise
add 1 js need to be reviewed
修改[20141224] by 光容

- 修改用語
- 修改提示長短
- 修改答案格子大小
修改[20141224] by 光容

- 修改格子大小
- 修改提示長度
Modity by Lipo on 12/23:
1. remove simplified chinese character
2. change hint color of the final answer
by Sunrise on 11/7
20141209 from sunrise.
change characters names.
Revised by Yuting. 20141224
by Sunrise on 11/07
[20141028] by Sunrise
Modified by Lipo on 12/24:
1. remove simplied chinese
2. '算式' instead of '方程'
3. change hint color
revise precision error.
修改[20141224] by 光容

- 句尾的句號
- 最後答案的上色