1-3 ADB 4-7 DCBC 8-11 BACD
12-15 ADCB 16-20 ECBDF
21-25 BACDA 26-30 CDBBD
31-35CABDA 36-40 CBCAD
41. hit 42. an 43. entire 44. making
45. will be banned 46. to protect
47. and 48. than 49. difficulties
50. said 1. contributed 改为contributes
2. what – which 3. stop 前加to
4. 删除 as 5. a 改为the 6. with 改为without
7. Cut 改为 Cutting 8. effective 改为effectively
9. our 改为my 10. do 改为does
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