26×3=____
想:
20×3=____
6×3=____
____+____=____
Please write a passage of basketball in about 90 words according to the following mind map.根据下面关系图写一篇有关篮球的90字文章。
如图为肺及肺泡与毛细血管之间的气体交换示意图,请据图回答下列问题: