A:裸岩上进行的演替
B:沙丘上进行的演替
C:冰川泥上进行的演替
D:弃耕的农田上进行的演替
Our Trip to Yibin City
When
On Friday.
How
We will go there 1.
What
But you will need to bring 2 .
Where
Then in the afternoon we will go to 3.
What time
⑴Now please remember that the bus will leave right at 4 .
⑵Tell your parents we'll be back at school 5.
读下图所示四幅山地垂直自然带带谱图,回答题。位于北半球的有( )
_____Jim going to help us?
25的算术平方根是( )