是指通过基因水平的操纵而达到治疗或预防疾病的疗法（）
A.体细胞治疗
B.细胞治疗
C.基因治疗
D.光量子治疗
E.分子学治疗
参考答案：C
When _____ his sister for some money, he couldn't keep feeling ashamed. [ ]
A. asked
B. was asking
C. being asked
D. asking
两个素数的积一定是合数．[ ]
