电视剧《锦绣未央》中,南安王拓跋余、东平王拓跋翰、高阳王拓跋浚,是哪一王朝的郡王( )
A:北凉
B:南凉
C:北魏
D:西魏
某DNA片段中胸腺嘧啶的比例为a,则该DNA片段中含有鸟嘌呤的碱基对占所有碱基对的比例是
A. Today is Sunday.
B. He flies a kite.
C. The girl plays with her teddy bear.
D. We read books.
E. They play catch with a ball.