21 What aspect of North America does the passage mainly discuss?
(A) The wide variety of climates
(B) Soil types and vegetation patterns
(C) Improved irrigation methods and the expansion of agriculture
(D) The change in precipitation patterns

17.According to the passage , the national and state governments did all of the following EXCEPT (A)build roads (B)import new plant varieties (C)give farmers money for their crops (D)develop policies that helped farmers export their products

18.All of the following are mentioned as examples of farmers’ meeting the expectations of agrarian philosophers EXCEPT (A)obtaining information from farm newspapers (B)accumulating personal wealth (C)planting new crops (D)becoming more scientific

19.The word “stunning” in line 24 is closest in meaning to (A)predictable (B)impressive (C)famous (D)gradual

20.Which of the following statements is best supported by paragraph 4? (A)Agricultural development contributed to development in other parts of the economy. (B)European agricultural products were of a higher quality than those produced in the United States. (C)The growing settlement of the West led to a decrease in agricultural production. (D)Farmers were influenced more by government policies than by market opportunities.

22 The word “spawn ” in line 1 is closest in meaning to (A) distinguish (B) eliminate (C) protect (D) create

23 The word “partitioning” in line 2 is closest in meaning to (A) division (B) modification (C) opening (D) circulating

24 According to the passage, acidic soils tent to be associated with (A) a high salt content (B) an increase in farming (C) large amounts of rain (D) glacial meltwater

25 The word “enhanced” in line 13 is closest in meaning to (A) implied (B) increased (C) indicated (D) informed

26 How did glacial meltdown affect the soil in North America? (A) It redistributed the soil types (B) It added salt to the soil (C) It made the soil more neutral in content (D) It added minerals to the soil

27 The phrase “this regionalization scheme” in line 19 refers to the (A) movements of glacial deposits (B) patterns of natural vegetation (C) human modification of the North American environment (D) distinction between humid America and arid America