突破3级就能摆脱验证码了，加油

67. A. among
68. D. sponsor
69. A. access
70. B. less
71. D. lack
72. C. fees
73. B. as
74. A. maintain
75. B. first
76. D. when
77. A. realized
78. C. strongly
79. D. led
80. C. particular
81. B. environment
82. A. encouraging
83. D. at
84. B. how
85. C. produce
86. A. growing
翻译
87. (that/which) they haven't found solution to
88. What most parents concern
89. in case it (should) turn cold.
90. decided to launch their own enterprise
91. until a doctor discovered it by chance.