Some people’s _______ is more efficient than others.
（A）metabolism
（B）microbes
（C）barriers
（D）bacteria
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- 1In college I _______ in science.What was your major?
- 2We have spent ( ) money on English books.
- 3The professor lived in an ______ tower.
- 4The first part of this paper is the _______ review.
- 5A general _______ is held in the United States every four years.
- 6Some people’s _______ is more efficient than others.
