A DNA library is
A.An international storehouse of all DNA data that has been collected to date
B.All the plasmids in a bacteria
C.All the genes in a bacteria
D.A collection of cloned DNA pieces
正确答案：A collection of cloned DNA pieces
A DNA library is
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- On weekend, I sometimes enjoy（）a few hours in the public library.
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- When we say somebody only goes to the library once in a blue moon, we imply that he seldom goes to the library.
- What does the space of the library represent?