一个正方形的边长增加______厘米,就可以使这个正方形的周长增加20厘米.
20÷4=5(厘米).
故答案为:5.
The boss said we had only three days to finish the work.
Don’t worry. We have already ____? two thirds of it.
A.got down
B.got through
C.given in
D.given away
下列()不是以改善和提高心肺及代谢功能,防治冠心病、肥胖、糖尿病等为目的运动项目。
A、步行
B、游泳
C、保健按摩
D、骑自行车