六位数加上1变成七位数，这个六位数就是最大的六位数999999．
故选：C．
用所给单词的适当形式填空。
1. Tom __________ (like) porridge for breakfast.
2. Dumplings are not OK. I __________ (do) like them.
3. Would you like some __________ (banana)?
4. Cookies __________ (be) delicious.
5. What __________ (be) for lunch?
膀胱结石典型的症状是（）
A.尿潴留
B.尿急、尿频
C.排尿困难
D.排尿中断
E.肾绞痛和镜下血尿
