41-45 ACDBA 46-50 DACCB 51-55 ACDBD 56-60 ADBCB
61. length 62. built 63. finishing 64. of 65. were made
66. increasingly 67. an 68. projects 69. more popular 70. If
1. that-which 2. pick up 删除up 3. by watch -watching
4. before we – after 5. place of interest – places
6. we see – saw 7. their country – our
8. a study trip – the 9. extreme – extremely
10. take part in 前加 to
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