9. The word "it" in line 12 refers to
(A) scientific agriculture
(B) James Oliver s invention
(C) the cast-iron plow
(D) Charles Newbold s fortune
10. Why did farmers reject Newbold s plow?
(A) Their horses were frightened by it.
(B) They preferred lighter tools.
(C) It was too expensive.
(D) They thought it would ruin the land.
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