The child may get confused at hearing the color of white used for paper when he/she first thought it as the word for snow. This

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问题 The child may get confused at hearing the color of white used for paper when he/she first thought it as the word for snow. This is an example for

选项 A、mental retardation.
B、over-extention.
C、hearing impairment.
D、under-extension.

答案D

解析 该例中,儿童起初认为白色只是用来描述雪的颜色,而在听到白色又被用来描述纸的颜色时会感到闲惑,这是典型的扩展不足。
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