肺部脱落细胞标本采集要求错误的是
A. 留取上午8-9点新鲜痰液为主
B. 痰检一般检查3-5次
C. 首选血丝及其附近的痰液
D. 标本首选血块、脓块
用单词的正确形式填空:1. Mike _________ (do) his homework every day.
用单词的正确形式填空:There __________(be) some water in the glass.
用单词的正确形式填空:I like singing. I often _________(listen) to the music in the evening.