20世纪90年代，台式电脑价格一般都在1万元以上；到21世纪

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20世纪90年代，台式电脑价格一般都在1万元以上；到21世纪初，台式电脑价格基本为7000-8000元；而现在，台式电脑价格基本都在5000元以内。这是由于（）

A．随着个别劳动生产率不断提高，单位商品的价值量不断减小

B．随着个别劳动生产率不断提高，全社会生产的商品价值总量不断减小

C．随着社会劳动生产率不断提高，单位商品的价值量不断减小

D．随着社会劳动生产率不断提高，全社会生产的商品价值总量不断减小

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相关试题

－I’m sorry for _______ in time.
—That’s all right.

A．getting it not done	B．not getting it done
C．getting not it done	D．getting not to do it

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The boy wanted to ride his bicycle in the street, but his mother told him _______.

A．not to

B．not to do

C．not do it

D．do not to

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We desire that immediate help _____ to the local villagers who have been trapped by the flood.

A．be given

B．will be given

C．should give

D．is given

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They ______ him to prepare for the coming exam, but he spent all day playing computer games.

A．persuaded

B．urged

C．suggested

D．made

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We didn’t know his telephone number, otherwise we ________ him.

A．would have telephoned	B．must have telephoned
C．would telephone	D．had telephoned

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