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
I can not spend ________ money on the car which is ________ expensive for me.
A.too much; much too
B.far too; too much
C.much too; too much
D.too many; much too
对于下面所列举的几种气体,可燃、可爆性气体有:()。
A、CH4
B、NH3
C、H2
D、CO2