牙本质发育不全 A．成釉细胞增生突入牙 * * B．牙齿发育

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问题单项选择题

牙本质发育不全

A．成釉细胞增生突入牙 * *
B．牙齿发育时牙 * * 组织向成釉器突起
C．釉牙本质界平直
D．釉基质合成、分泌或矿化障碍
E．局限性釉质增生

答案

参考答案：C

补全对话，情景问答

根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意义连贯、完整。

A: My God! It's nearly 7:30.

B: Hurry up, Dad. I have had my breakfast and 1.____________________________.

A: I will be late for work if I take you to school. Can't you walk there today?

B: But 2.__________________________! It will take me forty minutes.

A: But you know, walking is as important as eating and sleeping.

B: But 3.__________________________, if I spend too much time on walking.

A: It can also make you strong. 4.___________________________, I spent more than an hour walking to school

every day. Off you go, Peter!

B: Bye-bye! But you'd better remember to 5.____________________________, Dad.

多项选择题

对单位工程( )起控制作用的分部工程称为主要分部工程。

A．安全

B．功能

C．效益

D．工期

E．质量