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

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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The teaching method should be varied at different stages of learning（）achieving better results.

A.in order to
B.as a result of
C.with a view to
D.in relation to

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