肾癌不推荐的检查有（）
A.乳酸脱氢酶
B.碱性磷酸酶
C.MRI
D.肾血管造影
E.肾穿刺活检F.PET（正电子扫描）
参考答案：E, F
在DNA合成中，3’-OH与5’-P基团之间形成共价键。 ( )
— The accident was really terrible.
— Yes, it was. The young man on the bicycle was too _____. [ ]
A. careless
B. careful
C. carelessly
D. carefully
