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某男68岁，牙列缺失，要求做全口义齿修复

若该患者上下颌弓位置关系正常，牙槽嵴丰满，全口义齿人工后牙应选择（）

A.解剖式牙

B.半解剖式牙

C.非解剖式牙

D.20°牙

E.0°牙

答案

参考答案：A

完形填空

We often think of future. We often wonder __1________ the world will be like in a hundred years’ time.

Think ___2_____ space. Perhaps a permanent station on the moon ___3_____ (set up). Perhaps people will be able to visit the moon as __4______. Cheap rockets for space travel will have been developed, __5______ (permit) long journeys through the solar system. When that time comes, people will be taking holidays in space and visiting __6_______ planets. Great progress will have been made _____7___ medicine, too. Pollution will have been controlled in a hundred years’ time.

__8________ the world will have been developed — even Antarctica. We will have used up most of the earth’s land to build our cities; __9_______ floating cities will have been built. The Japanese have already had plans of this kind. And there will be cities __10______ the sea.

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单项选择题

基础生态学的不同等级单元由低到高排列顺序为( )。

A．个体、群落、种群、生态系统

B．种群、个体、群落、生态系统

C．个体、生态系统、群落、种群

D．个体，种群、群落、生态系统
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