A: How was your vacation, LiLei?
B: ____  I went to Beijing with my parents.
A: Cool! Where did you go in Beijing?
B: We went to the Summer Palace, the Palace Museum and so on.
A: ____ 
B: It’s interesting. I really like the Palace Museum. It has many beautiful things from different dynasties.
A:____ 
B: Yes, I did. I saw Jackie Chan on the Great Wall. And I got his autograph.
A: Wow, that's great! Could you show me his autograph?
B: Yes, sure. ____ 

科学探究的一般过程，大致可分为①____，②作出与问题有关的推测或猜想，③制定解决问题的方案，④____ ，⑤分析结果、得出结论，⑥反思、评价过程等6个环节．

把100g质量分数为98%的浓硫酸稀释成10%的稀硫酸，需要水的质量（　　）

为了探究某脱氧剂的成分（由两种单质组成）及利用该脱氧剂测定空气中氧气含量，兴趣小组进行了如下实验：

根据下图，在不考虑其他因素的情况下，下列判断正确的是（   ）

①A可能是高档耐用品曲线，B可能是生活必需品曲线 

②B可能是高档耐用品曲线，A可能是生活必需品曲线 

③由A曲线可以看出收入变化与需求量变化成反比

④由B曲线可以看出收入变化与需求量变化成正比