He _____ late for school. [ ]
A. is often
B. often is
C. does often
D. often does
答案:A
一潜水员潜到﹣10m时,发现在他的下方5m处有一条小鲸鱼在游弋,则这条小鲸鱼所处位置的高度为 _________ m.
下列营养素与心血管疾病无关的是
A.蛋白质
B.脂肪与胆固醇
C.碳水化物
D.无机盐
E.膳食纤维