单项选择题

The _______ between rich and poor is wider in the South than in the rest of the country.

A．difference
B．distinction
C．gap
D．variation
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She was so _______ in her book that she didn't hear the telephone rang.
A．absorbed
B．attracted
C．drawn
D．concentrated
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The newly-passed law imposed _______ on the export of high-technology goods.
A．obligations
B．commitments
C．emphases
D．restrictions
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