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问题 单项选择题

以下哪项不是龋病的特征（）

A.为常见病，多发病之一

B.为牙体硬组织的细菌感染性疾病

C.牙体硬组织在色形质各方面均发生变化

D.基本变化为有机物分解和无机物脱矿

E.能不经治疗自行修复

答案

参考答案：E

判断题

自动分拣机只适于分拣底部平坦且具有刚性包装规则的商品。袋装商品、包装底部柔软且凹凸不平的商品，包装容易变形、易破损、超长、超薄、超重、超高、不能倾覆的商品，不能使用普通的自动分拣机进行分拣。
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补全对话，情景问答
请从方框中选择最佳答案完戍对话
A: They`re both important.
.B: You can see nice art everywhere.
C: I don't think we can make it.
D: It can be heard everyday.
E: Nobody likes you.
F. I think music is more interesting than art.
G. No one enjoys your pictures.
Jim: What do prefer, art or music?
Kate: I prefer music to art.    1   
Jim: Really? I can't agree with you. Art is more interesting than music.    2   
Kate: No. Music is much more popular.    3   
Jim: But I have to say you don' t sing well. I'm afraid nobody likes to listen to you when you sing.
Kate : But you draw badly.    4   
Mother: Oh, my children, stop talking like that, please    5    They make our lifemore interesting
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