fossilization
【正确答案】：Fossilization refers to the break in learning which occurred some way short of target language competence while the internalized rules system contained rules different from those of the target language system. For example, a common fossilized error is the Chinese sound /d/ in English interlanguage pronunciation of "dat" for "that".
评分标准：答对得3分；解释不当，酌情扣分
