问题
单项选择题
有关固有牙槽骨的说法，不正确的是（）
A.位于牙槽骨窝内壁包绕牙根
B.在牙周膜炎症和外伤时最先消失
C.是一层多孔的骨板称筛状板，为松质骨
D.骨板为束状骨
E.近骨髓侧骨板由哈佛系统构成
答案
参考答案：C
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有关固有牙槽骨的说法，不正确的是（）
A.位于牙槽骨窝内壁包绕牙根
B.在牙周膜炎症和外伤时最先消失
C.是一层多孔的骨板称筛状板，为松质骨
D.骨板为束状骨
E.近骨髓侧骨板由哈佛系统构成
参考答案：C
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| On the afternoon of April l, the bell rang 1 the end of school. The students 2 their books into their bags. They were ready 3 home. Just at the moment, their English teacher came into the classroom and said to them,"Hello, boys and girls. Now go over the English lessons, and we'll have a test 4 half an hour." 5 these words, she left. The students looked at each other in surprise. How sudden! The teacher had never told them they would have a test, yet they took out their English books and began to work hard. They studied and studied. It was getting dark, 6 the teacher hadn't come yet! The monitor went out to the teachers' office. 7 minutes later, the English teacher came in with a smile. But she had 8 in her hand! "I'm sorry, but do you know 9 ?" she said. After the students heard this, they couldn't help 10 and saying "April Fools !" | ||||
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