28yr-old single lady Shenyang B2 1000

have my 2yrs MS in TX, graduate in 2009. this is the first time for me to be issued a B2 visa, as a 28yr-old single lady. only DS160 confirmation letter, visa application fee receipt, passport, 2" pic were handed in. even no bank statement/salary statement check. 3 Qs asked by VO:
1. what are you going the States for? (and he actually asked in chinese, however, i respond in english by default)
---just for travel.
2. you are working in XXX?
---yep
3. have you ever been in the States?
---sure, for my MS, 2yrs
4. how long you planned to stay this time?
---2wks.
VO: thanks, you'll be issued the visa w/ no problem.
Me: thanks sir, have a time weekend.

that's all