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24

A. People in many parts of the world preferred small-sized families
B. There have been extended families in most parts of the world
C. Many elderly people were unwilling to take care of their grandchildren
D. So many young Americans refused to live together with their parents

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25

A. Leave their young generations alone
B. Avoid being a burden to their children
C. Stay healthy by engaging in joyful activities
D. View things from their children’s perspective

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机器的最小制造单元是：

A. 机器
B. 机构
C. 构件
D. 零件

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机器的最小运动单元是：

A. 机器
B. 机构
C. 构件
D. 零件

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机器是由一个或几个（）组成，机构是由若干个（）组成，构件由一个或几个（）组成。

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24

A. People in many parts of the world preferred small-sized families B. There have been extended families in most parts of the world C. Many elderly people were unwilling to take care of their grandchildren D. So many young Americans refused to live together with their parents

25

机器的最小制造单元是：

机器的最小运动单元是：

机器是由一个或几个（ ） 组成，机构是由若干个（ ）组成，构件由一个或几个（）组成。

A. People in many parts of the world preferred small-sized families
B. There have been extended families in most parts of the world
C. Many elderly people were unwilling to take care of their grandchildren
D. So many young Americans refused to live together with their parents

机器是由一个或几个（）组成，机构是由若干个（）组成，构件由一个或几个（）组成。