单项选择题

Which of the following was NOT one of the names given to the Western grasses

A．Grama grass
B．Bluejoint grass
C．Buffalo grass
D．Mesquite grass

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单项选择题

According to the passage, the cattle helped promote the growth of the wild grasses by

A．stepping on and pressing the seed into the ground
B．naturally fertilizing the soil
C．continually moving from one grazing area to another
D．eating only small quantities of grass

单项选择题

Which of the following can be inferred about the cultivated grass mentioned in the second paragraph

A．Cattle raised in the eastern United States refused to eat it.
B．It would probably not grow in the western United States.
C．It had to be imported into the United States.
D．It was difficult for cattle to digest.

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