题目内容

导线的敷层一般为易燃材料。

A. 对
B. 错

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The writer tried a MOOC that his friend suggested because it was cheap and possible ________.

A MOOC is a course in which you may find a lot of subjects and _________to know what the course is like.

People who read everything on the forums won’t have time to finish the lectures, for ___________.

One of the disadvantages of a MOOC is that the percentage of the students who finish the course is ________.

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