A: 74. B 75.D 76. A 77. C 78.A 79. B B: 80.D 81A 82.B 83.C 84.D 85.C
C: 86. easier 87.hand 88.public 89. Although 90.all 91. worry 92. properly D: 93: (British writer) Sir Arthur Conan Doyle. 94: is to control the world with black “magic”. 95: No, it isn’t.
96. (simply) looking at his footprints/(sharp eyes) 97. Both
98. (possible answer: eg. sharp eyes, he must discover clues hidden at crime scenes with them(可以用文章中的内容，也可以是自己的想法，只要言之有理，语法正确都可以视为正确答案。)