81. B more than one aspect
82. A it gives the scientist confidence and pleasure in work
83. A easily believe in unchecked statements
84. C scientists's way of thinking and acting
85. B objective
86. A Latin Amercia has long received attention
87. D on a plain
88. C clearer
89. B the emergence of the internet
90. D optimistic
91. B trivial
92. D in the same paragraph
93. D generosity
94. C remember others' words
95. C forgetting details of memorable events
96. D family members and guests
97. C men and women in near Eastern societies
98. A the type of food
99. D social status
100. D culture and manners of eating