单项选择题

案例分析题 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
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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.
单项选择题
From what Mr. Collins said, we can know that he ______.
A．had only an incomplete picture of what happened
B．heard and saw nothing at all
C．talked to the pilot
D．was once a pilot
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