A:She is wearing a dress. She is nice.
B:She is wearing trousers. She is nice.
分一分,填一填。
下面的图形中有____ 个三角形,有____个长方形,有____个正方形,有____个圆;最多的是____形,最少的是____形,一样多的是____和____。
如图为细菌结构的示意图,请根据图回答下列问题:
巴拿马运河沟通了