单项选择题

A．world travel
B．education
C．knowledge of the world
D．service
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单项选择题
A．she wants to be interactiveB．they are convenientC．they help to focus the learners’ attentionD．she is afraid of technology
A．she wants to be interactive
B．they are convenient
C．they help to focus the learners’ attention
D．she is afraid of technology
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