单项选择题

A．The influence of coffee on the heart.
B．What kind of gene is beneficial to people.
C．How to find out what gene one has.
D．How many cups of coffee people should have each day.
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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.
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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