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

39. Whether as general, emperor, and author, Julius Caesar was fated to enjoy enduring fame throughout much of the world. (A)and (B)was (C)to enjoy (D)throughout (E)much

40. Throughout her length career, Maria Marcey has been known for her ability to capture the distinct rhythms of Boston  speech in her poems. (A)length(B)has been known(C)ability(D)distinct(E)speech

41. Laudenslager’s experiment showed that the immune system of these rats who could turn off the electricity _______. (A) was strengthened (B) was not affected (C) was altered (D) was weakened (E) was created

42. According to the passage, the experience of helplessness causes rats to _______. (A) try to control unpleasant stimuli (B) turn off the electricity (C) behave passively in controllable situations (D) become abnormally suspicious (E) act madly as if being threatened

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

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

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.