Thanks JessicaIt appears that English is not your first language, so if your application was filled in the same way as your postings, this may be one of the reasons why you have been rejected.
For these jobs they will usually receive 100's of applications, I have worked on recruitment projects where we have had almost 1,000 applications. The question people have to ask themselves is if there are 500 applications, why should they pick you and reject the other 499. I have worked in HR/Recruitment roles and the number of people that think they meet the criteria for a job, when they clearly don't can be mind boggling! I recently applied for a job. I received a call from the Recruiting Team and it turned into a 15 minute phone interview to assess my suitability to move onto the next stage, because of my background I thought this might happen, so you have to be ready to answer the questions and promote yourself, there are often a couple of questions they will ask and these are specifically designed to exclude people if they don't answer correctly so they can reduce the shortlist.