用软橡胶或弹性塑料制成，戴在上下颌所有牙齿的冠部，此种保持器

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问题单项选择题

用软橡胶或弹性塑料制成，戴在上下颌所有牙齿的冠部，此种保持器是下列哪一种

A．牙齿正位器
B．标准的Hawley保持器
C．颏兜
D．黏固式下前牙固定舌侧保持器
E．改良Hawley保持器Ⅱ型

答案

参考答案：A

听力题

根据句子意思和所给中文或首字母提示,写出单词的正确形式。（每小题I分满分8分）

小题1:Canada has two __________ (官方的) languages: English and French.

小题2:The f______ toys have attracted a lot of children.

小题3:If he gets that _________(职位），I think he can do it well.

小题4:Though he e_________ from the big fire, his skin was severely burned.

小题5:Jane ________ (忽视) his invitation to the party by not giving him a reply.

小题6:In some countries, especially in some poor countries, women are not really e________ to men.

小题7:This kind of washing powder is of good q_______. It doesn’t harm our hands.

小题8:If you can’t show us any ________(证据), we will not be able to believe you.

单项选择题

格斯说，他的作品“汇集了法国社会的全部历史”，堪称19世纪上半期资本主义的“社会百科全书”。恩格斯所说的作家是（）

A.巴尔扎克

B.雨果

C.司汤达

D.莫泊桑