有关慢性龋的描述错误的是
A．只见于成年人
B．病变进展慢
C．病变组织色深而干硬
D．色素渗透超过细菌入侵层
E．去腐时不易大块去除
参考答案：A
用所给单词的适当形式填空
1. School __________(start) at 8:00 in the morning.
2. He is the __________(good) student in our class.
3. Can you __________(tell) me a story?
4. He gives __________(I) a big cake.
5. I have a lot of __________(homework) to do every day.
（）年底，全国各省份完成农网改造的地区，基本上实现了城乡居民生活用电同价。
A.2003
B.2005
C.2007
D.2009
