题目内容

This system is extremely () because it runs on half price electricity.

A. economic
B. economical
C. thrifty
D. saving

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A. invaded
B. inserted
C. escaped
D. avoided

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A. established
B. launched
C. initiated
D. developed

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A. version
B. edition
C. series
D. issue

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A. assured
B. asserted
C. assumed
D. assaulted