对于粘固前有过敏症状的预备牙，粘固前在基牙表面涂_______溶液中和粘固剂的酸性。
参考答案：氢氧化钙
按括号内要求完成下列句子，每空格限填一词。
1. Grace learns English by reading aloud. (改为否定句)
Crace ____ _____English by reading aloud.
2. Tina was waiting for me when I arrived at the museum. (对画线部分提问)
___ was Tina ____ when you arrived at the museum?
3. We may put the flowers in the classroom. (改为被动语态)
The flowers may ____ _____ in the classroom.
4. He isn't old enough to see this thriller. (改为同义句)
He is ____ young ____ see this thriller.
5. 他们将建立粮食储备所来帮助贫穷的人们. (汉译英)
They will ____ ____a food bank to help the poor people.
以下对颅底凹陷症描述错误的是（）
A.可有延髓麻痹症状
B.可有颈神经根症状
C.多为儿章期起病，进展缓慢，可因头部突然用力而诱发
D.早期一般无高颅压，晚期可出现
E.可有椎-基底动脉供血不足症状
