Prefixes occur at the beginning of a word and modify the meaning of the stem, but do not change the part of speech of the original word.
A.正确 B.错误正确答案F
Prefixes occur at the beginning of a word and modify the meaning of the stem, but usually do not change the part of speech of the original word, There are exceptions to the rule
评分标准：答对得2分；正误判断错误扣全分。纠正错误不当，酌情扣分
