单项选择题

Students who have registered for this course must take performance tests at monthly ______.

A．gaps
B．standard
C．length
D．intervals
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单项选择题
The synthetic fibers produced in that plant ______ one third of all turned out in the area.
A．fill up
B．account for
C．consist Of
D．take out
单项选择题
He ______ the mountains quite a few times before making a painting of them.
A．painted
B．sketched
C．composed
D．pictured
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