题干
—Are you sure this is a photo , the famous comedy actress?
—It surprised you, didn't it? But she was once really thin.
A：Jia Ling
B：Jia Ling's
C：of Jia Ling
D：of Jia Ling's
答案(点此获取答案解析）
C
=0.7时，在整个DNA分子中这种比例是（ ）