细胞的遗传物质是()
A.DNA
B.RNA
C.DNA或RNA
D.DNA和RNA
参考答案:A
物质的量浓度都是0.1摩/升的下列各溶液中,PH值最大的是[ ]
A. HCl
B. Al2(SO4)3
C. H2SO4
D. CH3COONa
You should know _______to spend all your money on those impractical fancy goods.
A.other than
B.rather than
C.more than
D.better than