单项选择题

Some students can't attend ground classes because they ______.

A．are too lazy
B．don't have the money to study
C．may not be able to attend classes for military reasons
D．are sick or too busy
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单项选择题
Sometimes online distance learning can be a problem because ______.
A．it is not as interesting as face-to-face learning
B．the learners only have the written text
C．some students don't know how to organize their time
D．some learners don't need face-to-face cues
单项选择题
What is online distance learning
A．All interaction between teachers and students is accomplished "online" through an Internet or intranet connection.
B．Learning at home.
C．A system of learning on your own by writing letters.
D．A learning system for college and university students.
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