完形填空
67. B.through
68. C.specific
69. A.key
70. B.different
71. B.prevent
72. A.in
73. C.focus
74. A.over
75. C.rather
76. B.consumed
77. A.vital
78. C.amazed
79. B.contain
80. B.interact
81. C.on
82. D.up
83. B.Fill
84. C.avoid
85. D.doubt
86. C.impact