单项选择题

Buck learned to survive in the arctic by ______.

A．its primitive character
B．becoming the strongest
C．the law of club and fang
D．adapt itself to the cold arctic
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单项选择题
Which of the following is a possible cause of changes in the role of the child in the United States
A．An increase in technology.
B．The growing complexity of the child's psychological needs.
C．A decrease in the child's intellectual capacities.
D．The growing number of single parent families.
单项选择题
What can be inferred about formal schooling in colonial North America
A．It was generally required by law.
B．It was considered relatively unimportant.
C．It was improperly administered.
D．It was highly disciplined.
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