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.
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单项选择题
We can draw from the passage that the primitive character within Buck refers to ______.
A．Buck's adaptability to the cruel wild life
B．the learning of the law of club and fang
C．Buck's ability to fight with head and claw
D．becoming the strongest individual to rule
单项选择题
The story was set primarily in ______.
A．Klondike in Canada
B．a farm in California
C．the Yukon
D．the wild in California
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