A. Cattle raised in the Western United States refused to eat it.
B. It had to be imported into the United States.
C. It would probably not grow in the western United States.
D. It was difficult for cattle to digest.
Đáp án là C. “. It grew well with enough rain, then when cut and stored it would cure and become nourishing hay for winter feed. But in the dry grazing lands of the West that familiar blue joint grass was often killed by drought.”
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