Both Memorial Day and（）are observed in memory of those who have given their lives for the United States.

Owners of a legal right to a book may（）their right to someone else through a written contract.

A.imitate
B.document
C.change
D.transfer

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In the United States，the seats in the Senate are allocated to different states（）

A.according to their population.
B.according to their size.
C.according to their tax paid to federal government.
D.equally.

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