8. B

9. C

10. A

11. A? 本題可以在F段的第三句話找到答案 In the cracking unit, large hydrocarbon chains are broken into smaller ones.

12. C

13.? B 這一題可以在F段的最后一句話中找到

這篇文章講述的是關(guān)于煉油的過程，描述了煉油的價(jià)值和重要性。在閱讀的過程中有很多生詞都需要有詞典的查詢來作為輔助參考才能讀下去，有很多關(guān)于煉油的生詞是不會的，還需要去不斷的學(xué)習(xí)和積累詞匯來為以后的閱讀流暢打下基礎(chǔ)。

This article describes the process of refining oil and describes its value and importance. In the process of reading, a lot of new words need to be looked up in the dictionary as a supplementary reference to read on, and a lot of new words related to oil refining are not, but also need to continue to learn and accumulate vocabulary to lay a foundation for future reading fluency.