A Chinese farmer has developed an effective rat poison with a strong, sweet smell that can make rats come out of their holes from 500 metres away to eat it even in day light. Rats can not resist the temptation of the good smell of the poison. They will appear and taste the poisonous food, which makes them blind and causes death within two hours. In recent years, the rat population has increased in China to no less than three billion, an average(平均)of three persons. They eat about 15 million tons of grain each year and also spread some diseases. According to the passage, ______ seems to be able to persuade a consumer to buy the product.