参考答案：
26-30 CBCDA 31-35 BCDBC 36-40 ADCBA 41-45 ACDBA
46-47 DB 48-51 CABA 52-55 CDDB 56-60 DDCDB
66. a group of technologies 67. Cars and trucks.
68. Many new jobs. 69. Al’s recent developments have got a lot of social attention.
70. 它在许多方面改变着人们的生活和工作方式。
71. busier 72. an 73. up 74. happily 75. third 76. why 77. them 78. knew
79. classmates 80. for
Is it hot outside
Remember to arrive on time
What do you have for lunch
Lucy brought me a cup of tea
How beautiful your kites are
略
