Cracking Unification Alteration
8. B
9. C
10. A
11. A 本题可以在F段的第三句话找到答案 In the cracking unit, large hydrocarbon chains are broken into smaller ones.
12. C
13. B 本题也可以在F段找到，Platinum or platinum-rhenium is often used in chemical manufature and blending gasoline.
