单项选择题

Online courses keep learners very ______.

A．happy
B．busy
C．satisfied
D．free to do many things
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单项选择题
There are advantages and disadvantages of online distance learning. One advantage is ______.
A．it is easy to do
B．it is cheaper than face-to-face learning
C．it is convenient
D．it is satisfying
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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