【简答题】试比较两类核酸的化学组成、分子结构、分布及生物学作用。
【单选题】unsigned char a; unsigned char b; unsigned char c; a=125; b++; c=a/b; 执行以上程序后,变量“c”中的数值为( )。
【单选题】— Why is she absent? — She's absent ___________ she is ill. [ ]
【单选题】— Happy New Year, Miss White. — _________________ [ ]
【简答题】—Happy New Year! —______________ A.Happy New Year! B.Oh, no, thanks. C.Wish you, too. D.It ’s the same to you.
【简答题】试比较两类核酸的化学组成、分子结构、分布及生物学作用
【简答题】核酸的基本结构单位是 。核酸根据化学组成可分为 和 两大类。
【单选题】— Happy New Year, Mr Li! — _________________ [ ]