The threshold effect is also called the inch effect. It means that once a person accepts a trivial request from others, in order to avoid cognitive inconsistencies or want to give others a consistent impression, they may accept larger requirements. This phenomenon is like step-by-step step-by-step step-by-step stepping on the threshold, which makes it easier and smoother to climb high places. According to the above definitions, which of the following is items that do not meet the threshold effect? ['A survey shows that the proportion of residents in a city willing to donate to out-of-school children in poor areas is 30%. If people are asked to sign the initiative to help out-of-school children in poor areas, and then ask them to donate, the number of people willing to donate increases by 25%.', 'For students with learning difficulties, Mr. Li always puts forward some small requirements that are slightly better than in the past. After the students meet this requirement, they then gradually ask for higher requirements by encouraging them to make it easier for students to accept and Strive to reach the goal.', 'An enterprise successfully developed a whitening toothpaste that removes smoke stains. It has been well received by the market for its good effect of removing smoke stains. The company launched hot white irons and launched several white kinds of toothpaste with different tastes, although it was only the former one. The product was slightly improved, but it still became a bestseller.', 'A little monk learns martial arts with the master, but the master does not teach him anything, and only gives him a group of piglets for him to stock. There is a small river in front of the temple, and every morning the little monk will hold a pig to skip River, hug back in the evening, the piglet grows up day by day, and the arm strength of the little monk is constantly increasing, and he has unknowingly trained excellent arm strength and light power.']