A:铁粉和硫粉经充分研磨
B:酒精和水经充分搅拌
C:氢氧化铁胶体
D:CO2和H2混合后长时间放置
Look! This is 1 apple tree. I can see many 2. The apples 3red. They are round. How are they? They are 4. Apples, apples, I love 5. An apple a day keeps the doctor away.