“牙尖”是指A．牙釉质的长条状隆起 B．牙釉质过分钙化所形成的_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

“牙尖”是指

A．牙釉质的长条状隆起

B．牙釉质过分钙化所形成的小突起

C．牙冠上近似锥体形的显著隆起

D．牙釉质的纵形隆起

E．由两个轴面相交而成

答案

参考答案：C

选择题

Her mother often forgets _____ the door but this morning she remembered _____ it.

A．to close…to close

B．closing … closing

C．to close …closing

D．closing … to close

完形填空

Dear Annie,
I feel betrayed by my friend Hannah. We have been best friends 31 primary school and spend almost every day with each other.
On Monday, we had a surprise math quiz. I thought it was quite 32 and was not worried about the results. The next day after class, my math teacher told me that I had the lowest grade in the class! I felt so ashamed. I 33 Hannah not to tell anyone else, and she said she would 34 my secret.
35, the next day, I noticed that my classmates were 36 at me as I came into math class and, when I went to sit down, I was shocked to find a piece of paper on my desk that said, ‘Stupid Sarah got a D!’ I thought that Hannah 37 have told my classmates about my grade after promising not to.
I was so angry that I went 38 to Hannah and told her we weren’t going to be friends any more. She was really upset and swore that she hadn’t told 39 , but I didn’t believe her explanation. I don’t think I can ever truly forgive her. Now I have 40 my best friend. What shall I do?
Yours sincerely,
Sarah