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患者男，左下8765缺失，右下56缺失，拟行可摘局部义齿修复，左下4设计RPI卡环，右下47采用三臂卡环，舌杆大连接体连接 。

义齿设计中使用近中牙合支托和应力中断式卡环的主要目的 （）

A.增加义齿的固位

B.增加义齿的强度

C.防止基牙龋坏

D.减轻牙槽嵴负担

E.减小基牙上的扭力

答案

参考答案：D

完形填空

阅读下面的短文，按要求完成所给任务。每空一词。（共5小题，计10分）

James shook his money box.Nothing!He carefully counted the coins that lay on the bed.All that he had was $24.52.The bicycle he wanted was at least $90!How on earth(究竟）was he going to get the rest of the money?

He knew that his friends all had bicycles.It was hard to hang out with ①them when he was the only one without a bicycle. He knew his parents had no extra money.He would have to find a part-time job.He decided to ask Mr Clay②       advice.

“Well,you can start right here,”said Mr Clay. “You see,③my windows need cleaning and my car needs washing.”

That was the beginning of James’part-time job.For the next three months he worked every day after finishing his homework.He took dogs for walks,④打扫干净cupboards and repaired books.

The day finally came when James counted his money and found $94.32.He wasted no time and went down to the shop to buy the bicycle he wanted.He⑤__________(ride) home proudly,looking forward to showing his new bicycle to his friends.

小题1:写出①处所指代的内容。

______________________

小题2:根据句意写出②处所缺的单词。

______________________

小题3:完成③处划线部分的同义句。

My windows__________  ____________  ____________  ____________

小题4:将④处划线部分翻译成英文。

______________  _______________

小题5:用⑤处所给单词的正确形式填空。

_______________________
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单项选择题

社会保障是( )的产物和重要标志。

A．社会经济发展

B．人类文明

C．现代计划经济

D．现代市场经济
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