问题 单项选择题

复合树脂充填时,洞缘斜面做在

A.洞缘牙釉质

B.洞壁牙本质

C.洞缘牙本质

D.洞缘牙骨质

E.龈缘牙本质

答案

参考答案:A

解析:复合树脂充填时,洞缘牙釉质做洞缘斜面,酸处理后,形成微孔隙增加粘结修复效果。其他处不可能做洞缘斜面或对粘结修复效果无帮助。

阅读理解

A student is learning to speak British English. He wonders: Can I communicate with Americans? Can they understand me? Learners of English often ask: What are the differences between British and American English? How important are these differences?

Certainly, there are some differences between British and American English. There are a few differences in grammar. For example, speakers of British English say “in hospital” and "Have you a pen?” , Americans say “in the hospital” and ‘Do you have a pen?’.Pronunciation is sometimes different. Americans usually sound theirs in words like “bird” and “hurt”. Speakers of British English do not sound theirs in these words. There are differences between British and American English in spelling and vocabulary. For example, “colour” and “honour” are British, “color” and “honor” are American.

These differences in grammar, pronunciation, spelling and vocabulary are not important, however. For the most part, British and American English are the same language.

小题1:According to this passage, a student who is learning to speak American English might be afraid that __________.

A.British people cannot understand him

B.American people cannot understand him

C.the grammar is too hard for him

D.the spelling is too hard for him小题2: American English and British English are different in __________.

A.spelling

B.pronunciation

C.grammar

D.all of the above小题3:What is NOT mentioned(提及) in the passage?

A.Whether there are differences between British English and American English.

B.Whether British English and American English are one language or two.

C.How the differences between British English and American English came about.

D.How important the differences are.小题4:Most __________ say “Do you have a watch?”

A.British people   

B.Americans

C.children

D.teachers小题5:According to this passage, British people and Americans have __________ difficulty in understanding each other.

A.little

B.much

C.some

D.great

判断题