A boy lost his arms in an accident and his father lost his life. Since then, he had to1the arms of his younger brother. Except for writing with his toes(脚趾头), he could hardly do  2in his life.
    As the two brothers grew up together, they had lots of 3 and they often argued(争吵). Then one day, his younger brother 4 him. So he was very sad and didn't know 5 to do.
    A girl lost her hands because of a fire. Though her elder sister wanted to 6 her, she decided to be completely independent (独立的). At school, she always studied hard. Once she wrote the following in her composition, “I am 7. Though I lost my hands, I still have legs. Though my wings are broken, my heart can still fly.”
    One day, the boy and the girl were both invited 8 a television interview program. They both were asked to write something on a piece of paper with their toes. The boy wrote “My younger brother's arms are my arms”9 the girl wrote "Broken wings, 10 heart”.

—What does the symbol “<” mean? —It means “______”.

—Can you play      guitar?

—No．I can play    football．

人体每时每刻必须从空气中获得氧气，把体内的二氧化碳排到空气中，这一过程是通过呼吸运动来完成的．图（一）为呼吸系统模式图，图（二）为人体在平静呼吸时胸廓容积变化示意图，图（三）为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：