X线片上显示为包绕牙根的、连续不断的低密度线条状影像（）
A.牙釉质
B.牙骨质
C.牙槽骨
D.牙周膜
E.骨硬板
参考答案：D
仿照给定的句子续写三句话。
要求：①续写部分与给定句子的句式（不是……却……）相同，构成排比；
②要与给定句子所描写的主体一致，表现对医护人员的赞颂。
你不是启明星，却带来了希望的曙光；
______________________ ，______________________ ；
______________________ ，______________________ 。
按要求改写下列各句，每空一词。
1. I went to Hefei yesterday. (改为一般疑问句)
______ you ______ to Hefei yesterday?
2. The weather was very bad. (改为否定句)
The weather ______ ______ very bad.
3. The girls had a good time on the school trip. (改为同义句)
The girls ______ ______ on the school trip.
4. The science teacher cleaned the bus yesterday afternoon. (对画线部分提问)
______ ______ the science teacher ______ yesterday afternoon?
5. Tina got Jack Dean's autograph. (对画线部分提问)
______ autograph ______ Tina ______?
