奥运场馆的游泳池长约50米,宽约20米,那么它的周长约为______米.
(50+20)×2
=70×2
=140(米)
答:它的周长约是140米.
故答案为:140.
I haven't seen Anna since she left our hometown two years ago, but we do keep in touch with each
other by sending e-mails __________. [ ]
A. here and there
B. sooner or later
C. at one time
D. now and then
甲、乙两图为世界著名的三角洲图。读图完成下列各题。
甲、乙两图所采用的比例尺()
A.无法判断
B.甲乙相同
C.甲大于乙
D.乙大于甲