77. B) behind

　　78. D) insignificant

　　79. C) corporations

　　80. D) only

　　81. B) later

　　82. D) provided

　　83. D) besides

　　84. A) and

　　85. C) widespread

　　86. A) acquired

　　翻译答案

　　87. (in) concentrating on the experiment/ focusing her attention on the experiment.

　　88. did she become angry/did she lose her temper before.

　　89. being invited to attend the opening ceremony.

　　90. (should) be fixed/installed by the window

　　91. the strong opposition of her parents/ her parents’ strong opposition.