In recent years cattle breeders have increasingly used crossbreeding, in part that their steers should acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor.
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Ain part that their steers should acquire certain characteristics
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Bin part for the acquisition of certain characteristics in their steers
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Cpartly because of their steers acquiring certain characteristics
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Dpartly because certain characteristics should be acquired by their steers
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Epartly to acquire certain characteristics in their steers
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正确答案: E