9. A. have to B. must C. should D. need
10. A. according to B. owing to C. due to D. with respects to
11. A. sent B. picked up C. collected D. helped
12. A. passengers B. hikers C. drivers D. strangers
13. A. fences B. barriers C. gaps D. walls
14. A. global B. world C. entire D. whole
15. A. discussions B. debates C. consultations D. lessons
答案:1.B 2.D 3.A 4.C 5.A 6.D 7.B 8.C 9.D 10.A 11.B 12.C 13.B 14.A 15.D
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