DNA复制、转录、翻译的主要场所依次是[ ]
A.细胞核、细胞质、细胞质
B.细胞核、细胞核、细胞质
C.细胞质、细胞核、细胞质
D.细胞核、细胞质、细胞核
答案:B
You'd better some flowers behind the house. [ ]
A. to grow
B. grows
C. growing
D. grow
简述航空运输的主要优点和局限性。