单选题 Which of the following is not the example of applying the threshold method?

A、 Parents introduce spinach in small bites or mixed with a food that the child enjoys over time so that the child will not refuse to eat it.
B、 Teachers introduce academic content in short blocks of time for young children and gradually increase session length but not to where students become frustrated or bored.
C、 Paper with wider lines is first used and then paper with narrow lines is introduced step by step to help children learn printing and handwriting.
D、 A child might be made to throw toys until it is no longer fun by his parents in order to change his behavior of repeatedly throwing toys.

【正确答案】 D

【答案解析】由第二段可知，开端法(threshold method)和少儿能集中注意力的时间长短有关，教师应该循序渐进，慢慢延长其注意力集中时间，所以B是正确的；根据第三段可知，开端法还可用于训练少儿书写习惯，行高应先宽后窄，所以C正确；再由此引申出去，开端法就是循序渐进的方法，所以A也正确；阅读下文可知，D是疲倦法(fatigue method)的运用。