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患者女性，10岁，因“替牙不整齐”来诊。口腔检查：磨牙远中关系，上前牙前突有间隙，前牙深覆盖，下颌明显后缩，面部下1/3短。

最佳治疗方案是（）

A.观察至恒牙列拔牙矫治

B.不拔牙矫治，功能性矫治器前导下颌

C.头帽式肌激动器

D.固定矫治器

E.头帽、口外唇弓

答案

参考答案：B

句型转换

按要求改写句子，每空只填一词。

1. He often does his homework after supper. ( 改成一般疑问句)

    _______ he often _______ his homework after super?

2. They were excited at seeing the film. (改成感叹句)

    _______ _______ they were at seeing the film.

3. He has learned to play the piano since he was five years old. (对划线部分提问)

    _______ _______ has he learned to play the piano?

4. English is so hard that I can't learn it well. (同义句)

    English is               hard for me               learn it well.

5. Both Lucy and Kate are Americans. (否定句)

    _______ Lucy              Kate is an American.

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单项选择题

某项目达到设计生产能力后正常年份的税前利润为1200万元，税后利润为960万元，技术方案资本金为4000万元，则该技术方案资本金净利润率为（）。

A．18%

B．20%

C．24%

D．30%
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