问题
单项选择题
关于牙本质小管，不正确的叙述是
A．近牙髓一端较粗，越近表面越细
B．行程中可有许多侧支可存在于球间牙本质内
C．在近髓侧和近表面每单位面积内小管数目之比为4:1
D．可越过釉牙本质界，进入釉质内
E．在牙颈部弯曲成“∽”形
答案
参考答案：D
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关于牙本质小管，不正确的叙述是
A．近牙髓一端较粗，越近表面越细
B．行程中可有许多侧支可存在于球间牙本质内
C．在近髓侧和近表面每单位面积内小管数目之比为4:1
D．可越过釉牙本质界，进入釉质内
E．在牙颈部弯曲成“∽”形
参考答案：D
| 完形填空。 | |||
| Tom and his sister 1 a big house. The house is 2 the foot of 3 hill. Near 4 there is a school. There 5 four people in their family. Their father is a farmer. He has a 6 and works 7 it all day. Their mother is 8 home. Tom goes to school, but his sister 9 . Tom likes 10 and running. His sister likes them, too. | |||
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