气体交换的场所是
A:肺
B:咽和喉
C:气管和支气管
D:鼻腔
物质
甲
乙
丙
丁
反应前质量(g)
20
50
80
30
反应后质量(g)
0
100
x
I think July is ____ (hot) than any other month in our country. It's ____ (hot) month of the year.