31 B) By noting where the most severe earthquake in U.S. history occurred.

　　32 C) Stop him when he had difficulty understanding.

　　33 D) It is a tool of communication among speakers of different languages.

　　34 D) It has supporters from many countries in the world.

　　35 D) It has had greater impact than in any other country.

　　Section C

　　36. intelligent

　　37. foundations

　　38. romantic

　　39. reflects

　　40. profound

　　41. dramatically

　　42. deprived

　　43. hindered

　　44. research shows that communicating with others promotes health, whereas social isolation is linked to stress, disease, and early death.

　　45. A group of researchers reveal scores of studies that trace the relationship between health and interaction with others.

　　46. loneliness harms the immune system, making us more vulnerable to a range of miner and major illnesses.