Is there an answer to prevent cancer through healthy living?

Analysis of answer B: The external causes of cancer cell formation are mainly three kinds of carcinogens, namely physical carcinogens, chemical carcinogens and viral carcinogens. Ultraviolet rays in sunlight are physical carcinogens, and barbecue food and coal tar contain chemical carcinogens. So choose B. Test site: carcinogenic factors. Comments: The test questions are relatively simple, focusing on the connection between basic knowledge and real life.