短文中共有10处错误，错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号(∧)，并在此符号下面写出该加的词。

删除：把多余的词用斜线( \ )划掉。

修改：在错的词下划一横线，并在该词的下面写出修改后的词。

注意：

1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者(从第11处起)不计分。

Tom finished his middle school half a year before and then he worked for a postman in his small town. As he was afraid of dogs, he often had a lot of troubles. One afternoon, he tried to take a post card to a bigger house by bike. When he reached the house and got off from his bike at the gate, at once a large dog came run at him with much noise. Tom quickly threw the card through the gate. With his surprise, the dog didn’t make any noise. It ran fast to a card, picked it up with its mouth, carried it towards the house. Tom thought for a while and said to him, “The dog is a better postman than I am.”

生理情况下，外周血中平均直径最大的白细胞通常为（）。

A.嗜酸性粒细胞

B.嗜碱性粒细胞

C.单核细胞

D.中性分叶核粒细胞

E.中性杆状核粒细胞