A:①②
B:①③
C:②③
D:③④
Changes in our school
Number(in the past)
Number (now)
Classrooms
12
60
Students
590
1280
Library
0
1
Teachers’offices
6
15
Computer rooms
3
例:There were only 12 classrooms in our school, but now there are 60 classrooms.
如图为人体内肺部的气体交换图,请据图回答:
下列句子中标点符号使用正确的一句是( )