三亿三千万零三，这个数中一共有______个0．
三亿三千万零三写作：330000003，
这个数中一共有6个0，
故答案为：6．
The boys in my class often _____ basketball on the playground after school.[ ]
A. play
B. plays
C. played
D. are playing
破伤风抗毒素（TAT）过敏试验法的计划
