It is often mentioned that it is difficult for college graduates to find employment. However, according to statistics, in recent years, the ratio of job vacancies to job seekers in China has generally been greater than 1, and the demand in the labor market is greater than supply. Among the job seekers, college graduates have a higher education level. As a result, China's college graduates do not actually have the problem of difficult employment. If the following information is true, which of the following can effectively refute the above conclusions are:. ['The current economic downturn is under great pressure, and many companies have strictly controlled labor costs and have started to lay off employees.', 'Some of the most scarce jobs in the labor market are mainly suitable for senior technicians.', 'College graduates are often highly competitive.', 'Some high-skilled talents earn more than university graduates.']