单项选择题

The habit of economy one of the greatest differences between the savage and civilized men.

A. contains
B. Contributes
C. constitutes
D. continues
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After ______ seemed an endless night, it was time for them to open the boxes of presents.
A. it
B. that
C. what
D. there
单项选择题
To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world-market demand.
A. improve
B. enhance
C. guarantee
D. gear
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