单项选择题

What can be inferred by the phrase" Legend has it" in line 1

A．The story of the train may not be completely factual.
B．Most history books include the story of the train.
C．The driver of the train invented the story.
D．The story of the train is similar to other ones from that time period.

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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.