阅读短文，选择正确答案
Yesterday was Saturday. It was sunny. I got up at 7:30. After breakfast, I went to the beach with Alice. There were many people on the beach. We ran, jumped and played volleyball on the sands. We swam in the sea. Some men fished on a boat. We had a good time. We were tired, but happy.
单词表：beach 海滩 sands 沙滩 tired 疲乏的 volleyball排球
链（各有141个氨基酸）和两条
链（各有146个氨基酸）构成，问在血红蛋白中有多少个肽键（ ）
