— Oh dear! It is very cold today, ________?
— Yes, it is. You need to wear warmer clothes.
A:isn't it
B:it isn't
C:is it
D:does it
看图列算式。
总共有几个苹果?
Her grandmother_ for ten years.
如图所示:一个正方形被分成A、B、C、D四个部分.其中,A和B的面积比是2:3,B和C的面积比是2:1.如果D的面积是42平方厘米,那么这个正方形的面积是____平方厘米.