47. Domestication of plants and animals probably occurred because of ______________________.
(A) need for more readily available food
(B) powerful cure of the plants
(C) lack of wild animals and plants
(D) early man’s power as a hunter
(E) the desire of prehistoric man to be nomadic

43. The reason why the mice in Ader’s experiment avoided saccharin was that _______. (A) they disliked its taste (B) it led stomach pains (C) it affected their immune systems (D) they associated it with stomachaches (E) they loathed the smell

44. The passage tells us that the most probable reason for the death of the mice in Ader’s experiment was that _______. (A) they had been weakened psychologically by the saccharin (B) the sweetener was poisonous to them (C) their immune systems had been altered by the mind (D) they had taken too much sweetener during earlier conditioning (E) the dysfunction of their digestive system

45. It can be concluded from the passage that the immune systems of animals _______. (A) can be weakened by conditioning (B) can be suppressed by drug injections (C) can be affected by frequent doses of saccharin (D) can be altered by electric shocks (E) can be strengthened by the sweetener

46. This passage mainly discusses __________. (A) the powerful members of the early societies (B) one aspect of early natural history (C) the beginning of agriculture (D) drugs and their uses (E) the imagination of prehistoric man

48. It can be inferred from the passage that an herbalist is . (A) a dreamer (B) someone who uses plants in medicine (C) an early historian (D) a florist (E) a farmer

49. Which of the following statements can be inferred from the passage? (A) The shape of a plant is indicative of its ability to cure ailments of a similarly shaped organ. (B) Early herbalists were unimaginative. (C) The work of early herbalists has nothing to do with present day medicine. (D) There is little relation between a cure for illness and the physical shape of a plant. (E) Pets, livestock, and plants were devised to cure illness.

50. The word “rudiments” is closest in meaning to __________________. (A) history (B) requirements (C) beginnings (D) protocol (E) regulations

51. The most appropriate main theme for this article is __________. (A) Democracy and Machines (B) Happiness and Men (C) Happiness and Democracy (D) Machines and Happiness (E) Men and Machines

52. Which of the following statements can best describe one of the main ideas in this passage? (A) The individual’s talent and characteristics have become more vital in this age of machines. (B) If the near future of the world could meet the increasing demands of democracy, life would be happier and easier. (C) A world of science and great machines can guarantee that people can lead a better life to come. (D) Men nowadays still desire faster machines and more advanced technology to standardize their ways of life. (E) Happiness has nothing to do with science and technology.

53. In the second paragraph, the author used the word “hankering.” What does it mean in its context? It means _____. (A) a fantasy or illusion (B) a strong, often restless desire (C) resoluteness with strong will (D) an unexpected idea (E) a happy imagination