A:大兴安岭
B:祁连山
C:天山
D:南岭
下列句子中措辞得体的一项是 ( )
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,点A、F、C、D在同一直线上,点B和点E分别在直线AD的两侧,且AB=DE,∠A=∠D,AF=DC.求证:四边形BCEF是平行四边形.