The following understanding of comics is correct: a. The influence of culture on people is subtle; B. mass media should not be the main promoter of cultural communication.

Analysis of test questions: This question examines the influence of culture on people. The students in the cartoon are subtly influenced by advertisements, so point A fits the meaning of the question and point B is wrong. Mass media can go beyond the limitation of time and space to the greatest extent, and has powerful functions of cultural communication, exchange and enjoyment. It is the main means of cultural exchange. Point c does not match the meaning of the question, and point d does not reflect it, so the answer should be a.

Comments: The influence of culture on people is subtle, generally not tangible and mandatory. Cultural atmosphere is intangible, but it affects people's thoughts and behaviors all the time. Participating in healthy and progressive cultural activities can make people get spiritual pleasure, cultivate sentiment and improve their aesthetic level and moral cultivation. These cultural influences not only occur in a subtle way, but also are the result of people's conscious learning and active perception of cultural edification. Therefore, we should actively participate in healthy and progressive cultural activities. The difficulty is moderate.