27. It can be inferred from the passage that most farmers did not own threshing machines because.
(A) farmers did not know how to use the new machines
(B) farmers had no space to keep the machines
(C) thresher owner had chance to buy the machines before farmers did
(D) the machines were too expensive for every farmer to own

23. According to the passage, why was the Civil War a stimulus for mechanization? (A) The army needed more grain in order to feed the soldiers. (B) Technology developed for the war could also the used by farmers. (C) It was hoped that harvesting more grain would lower the price of grain. (D) Machines were needed to replace a disappearing labor force.

24.The passage supports which of the following statements about machinery after the Civil War? (A) Many farmers preferred not to use the new machinery. (B) Returning laborers replaced the use of machinery. (C) The use of farm machinery continued to increase. (D) Poor-quality machinery slowed the pace of crop production.

25.Combines and self-binding reapers were similar because each (A) could perform more than one function (B) required relatively little power to operate (C) was utilized mainly in California (D) required two people to operate

26.The word “they” in line 17 refers to (A) grain stalks (B) threshing machines (C) steam engines (D) horses

28.The word “ponderous” in line 21 is closest in meaning to (A) Advanced (B) heavy (C) complex (D) rapid

29. Which aspect of the lives of the Native Americans of the north Pacific Coast does the passage mainly discuss? (A) Methods of food preservation (B) How diet was restricted by the environment (C) The contributions of women to the food supply (D) Difficulties in establishing successful farms

30.The word “unique” in line 2 is closest in meaning to (A) comprehensible (B) productive (C) intentional (D) particular

31.The word “attained” in line 3 is closest in meaning to (A) achieved (B) modified (C) demanded (D) spread

32. It can be inferred from paragraph 1 that the social organization of many agricultural peoples is (A) more complex than that of hunters and foragers (B) less efficient than that of hunters and foragers (C) more widespread than that of hunters and foragers (D) better documented than that of hunters and foragers

33. According to the passage, what is true of the “division of labor” mentioned in line 5? (A) It was first developed by Native Americans of the north Pacific Coast. (B) It rarely existed among hunting (C) It was a structure that the Native Americans of the north Pacific Coast shared with many other peoples. (D) It provided a form of social organization that was found mainly among coastal peoples.