单选题：One disadvantage of using robots is that they consume______.

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One disadvantage of using robots is that they consume______. A．too much energy
B．based on American designs
C．they are too costly
D．they are not reliable
E．quality control
F．free of charge

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Paragraph 3______.

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Much more countries have signed the FCTC than those that____A．have ratified it B

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