L2C 李梦媛 unit16 作业

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.