B

1-7:acabbda 
8;robots' artificial inteligence
9;weapons toxic waste,carbon dioxide.
10;many forms of injuries
11、B  12、A  13、C  14、D  15、C  16、A  17、C  18、A   19、B  20、D  21、B
22、D  23、C  24、A  25、C  26、B  27、A  28、B   29、C  30、C  31、A  32、B
33、C  34、C  35、B

47 causing a reaction   48 debate    49 To secure the approval of every victim's family    50 exploiting a national tragedy   51 raise awareness
52-56:ddbda
57-61:cbcaa
62-67:bdbbcd  68-74:dddaccb
82.who have devoted their whole life to poetry.
83.or else she would have replied my letter last week.
84. finish chemistry experiment
85. have the old couples quarrelled with each other
86. To a large extent one nation's future prosperity rests on