单项选择题

The key to introducing computers to classroom teaching is through

A．teacher training
B．curriculum design
C．software development
D．hardware purchase
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单项选择题
It is common that American children ______。
A．make troubles in public places
B．behave indecently when they grow up
C．talk to their parents in the same way as other cultures
D．are particularly lacking in civility at home
单项选择题
When Americans say Thank you , they ______.
A．are lying
B．mean nothing
C．are demanding help
D．show politeness
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