题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 A. It sounds too good to be true. B. However, nobody is perfectly fluent in any language. C. Quick fluency is good if you have some sort of deadline. D. But have you ever considered what fluency really means? E. But does fluency have the same meaning to other person as it does to you? F. Unlike perfect fluency, native-like fluency is a reasonable and attainable goal. G. To assist you in determining what fluency is, I'll describe a few different types of fl鱼缸里有35条金鱼，黑金鱼有8条，红金鱼有（    ）条A.21B.23C.25D.27