月英语六级真题第 1套—1—Questions 12to 15arebasedonthepassageyouhavejustheard.12.A)FarmershelpedNativeAmericansgrowcrops.C)There existedpost offices.B)Therewereexpansiveuniversitycampuses.D)Migrants foundgoldthere.13.A)IthelpedtoboosttheeconomyintheAmericanWest.B)It provided job opportunities for many...