问题
单项选择题
关于牙本质不正确的说法是()。
A.不如牙釉质坚硬
B.位于牙釉质与牙骨质的内层
C.白色透明
D.围成牙髓腔
E.是牙体的主质
答案
参考答案:C
关于牙本质不正确的说法是()。
A.不如牙釉质坚硬
B.位于牙釉质与牙骨质的内层
C.白色透明
D.围成牙髓腔
E.是牙体的主质
参考答案:C
完成对话,把正确选项的字母代号写在横线上。 | |
Tony: 1. _____ Where is your computer? Bob: 2._____ Do you have one? Tony: No, I don't. 3._____ Let's watch TV. Bob: No, it's boring. Let's play tennis. I have a tennis racket. Tony: Good. 4._____ Bob: On the sofa. Do you have a racket? Tony: No, I don't. But your sister has one. Bob: That's right. And she has a tennis ball. Tony: 5._____ |