单项选择题

案例分析题 One of the good aspects of online distance learning is ______.

A．speed
B．convenience
C．easy operation
D．variety of instruction
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单项选择题
Sometimes online distance learning can be a problem because ______.
A．learners can't afford it
B．learners get too many hints
C．it involves excessive writing
D．it is not available at the weekend
单项选择题
Which of the following is TRUE of the passage about online distance learning
A．It has more disadvantages than advantages.
B．It is a learning form based on internet.
C．It is not available for some students.
D．It has only enrichment classes.
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