水是生命之源，也是重要的溶剂。下列说法正确的是（ ）
A：水电解生成氢气和氧气，说明水中含有氢分子和氧分子
B：将20℃时硝酸钾的饱和溶液升温至40℃后溶液仍然饱和
C：天然淡水经沉降、过滤、吸附、灭菌等净化操作后，可供人们生活用水
D：稀释浓硫酸时，将水到入浓硫酸中，并不断搅拌
--- Will the new iphone cost a lot?--- I ________ think so. Apple's products are usually expensive.
若一个数可以用科学记数法表示为3.02×10﹣3，则这个数为____ ．
阅读理解。读文章，判断正（正确）误（错误）
Tomorrow will be Sunday. My friends and I will do lots of things. Mike will go fishing with his grandpa. Mary will go shopping with her mum. Bob will play football. Jim likes swimming. He will go swimming. I'm going to visit the Great Wall. I will take some photos.
