贝贝做实验，给100g盐水加热，水分蒸发完后得20克盐，这种盐水中盐与水的最简比是[ ]
A．20：100
B．1：5
C．1：4
答案：C
用所给词的适当形式填空
1. Good watches must have good _____(quality).
2. Don't you think the sofa is very _____(comfort) ?
3. How many _____(province) are there in China?
4. Who runs _____(fast) in this class?
5. I speak English _____(badly) than he does.
界面张力
