✔ 最佳答案
I don't know why others have to give you the wrong answers.
For 小小, B1/B2 Travel Visa can be used for short-term courses if the course meet certain requirements.
For Edmond, B1 is still a Travel Visa (but for business use only). In Hong Kong, the U.S. Consulate approves B1/B2 together...
In answering your questions:
What you should do is simply tell the truth - ask the employer to provide a vacation notice for 1 month (duration of the course and trip).
When asked, simply tell the Officer that you are going to study a short-term course (with document proof - remember even the school does not provide anything official, like I-20, you will still have some documents or brochure to prove the course enrollment).
What you are scare about is valid. However, the consequence of lying is worse than what you are scare - as you can be banned from the U.S. for life.
By the way, you still apply B1/B2 Travel Visa.