下列物质属于纯净物的是 ( )
A:矿泉水
B:冰水混合物
C:空气
D:牛奶
甲:____
乙:____.
Hello, I’m Linda. I have four friends. They are Ann, Lisa, Tom and Peter. Ann lives near school. She comes to school on foot. There is an underground station near Lisa’s home. She comes to school by underground. Tom lives far from school. He comes to school by bus. Peter likes riding. He comes to school by bike.
⒈ ____ ____
⒉____ ____
⒊____ ____
⒋____ ____
读一读,选择正确的答案,将字母代号写入前面的括号内。
① Is he nine? ____ A. Yes, I am.
② Are you a boy?____ B. I'm a cow.
③ Are you two? ____ C. I'm four.
④ How old is your sister? ____ D. She is ten.
⑤ Who are you?____ E. Yes, he is.
读倒U曲线图,用所学知识回答。