题目

根据对话内容，从后面的选项中选出恰当的句子补全对话。A：Hello! Thisis Sam.B：This isLucy speaking.A：Lucy, shallwe go for a walk along the beach?B：I'm busy now.A：B：I ammaking apple pies.A：Soundsnice!B：Thankyou. The pies will be ready in 20 minutes. Would you like to try some?A：Apple pies aremy favourite, you know. I can't wait to eat them!B：Comenow! It will be the right time when you arrive.A：Great! Seeyou soon.B：See you.A. What are you doing?B. May I speak to Lucy?C. Yes, I'd love to.D. Oh, I'm afraid I can't.E. You are really good at cooking. 食品中加入抗氧化剂可防止食品腐败，BHT（化学式C13H30O）是一种抗氧化剂，该物质的相对分子质量是　　，C、H、O的原子个数比是　　，碳元素的质量分数是　　（精确至0.1%）．