let me try to answer...

1. Puebla 和Choulola 各一天是否合理？
A: Puebla is a very lovely and cute city...depends on what your desire, it can be done in 1 day trip, or staying longer... Choulola is very small village, half day can be enough of strolling around...
2. Puebla與Choulola間有公交車嗎？
A: Yes, it has....try to goole it (i cannot remember the details anymore after several years)
3. Oaxaca 和Monte Alban 各一天是否合理？
A: It's better to plan minimal 2 days for Oaxaca city, a lot to see there......half day for monte alban is enough. There's local tour bus running between Oaxaca & Monte Alban, several shifts per day, frequently and conveniently.
4. 若乘公交車，下麵哪個行程更合理？
A. Mexico City - Puebla （Choulola）- Oaxaca - Mexico City
B. Mexico City - Oaxaca - Puebla （Choulola）- Mexico City
A: both work.
5. 除Teotihuacan外，Mexico City附近（1-2天行程）何處值得一遊？ Taxco值得去嗎？
A: for me all mexican small towns are interesting, worth visiting.....
6. 有人去過Toluca嗎？ 有公交車從Puebla到Toluca嗎？ 那裏有個植物園的頂和雪山湖泊對我的吸引力很大：）。
A: not been there yet....no comments.....

just my 2cents.....