下列哪句说法是错误的?( )

数学课上，老师在讲解例题的解法，小明突然举手说，他想为大家演示例题的另一种解法，老师恰当的处理方式是(　)。

下列属于负强化事例的是()。

Teachers who believe in the __________ model will enable students to understand the meaning and usage of the words first, and then make full use of the words in listening, reading or writing tasks, ask representatives to show products of the tasks, and give an evaluation for it at last when teaching vocabulary.

下列乐器中，不属于中国传统乐器的是（）