单项选择题

VCR has many advantages, but it also has its limits which lie in ______.

A．it's not easy to duplicate prerecorded movies
B．it can not duplicate prerecorded movies
C．it can not be operated easily
D．it takes too long to duplicate prerecorded movies

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单项选择题

What's the advantages of VCR-2

A．It can make high-quality duplicates of prerecorded tapes easily.
B．It can let viewers watch a tape while simultaneously recording off the air.
C．It can duplicate prerecorded movies clearly.
D．Both A and B.

单项选择题

According to the passage, the suitable word which can replace drawback is ______.

A．breakthrough
B．advantage
C．barrier
D．function