计算（6×103）·（8×105）的结果是[ ]
A． 48×109
B． 4.8×109
C． 4.8×108
D． 48×1015
答案：B
He saw a girl sandwiches in the shop when he came in.[ ]
A. to buy
B. buying
C. bought
D. buy
肿瘤化疗的适应证有哪些
