北師大版高中英語選修七unit21humanbiologywarmupword學案(完整版)
【正文】 100,000 interval digest swap hearing pulse n. 聽覺 ；間歇 n. 脈搏 vt. 消化 vi. 交換 times a day. With each beat, it circulats 80 ml of blood through the body— that’s 8,000 litres of blood per day! It pumps blood into the lungs, where it receives oxygen, Before being pumped around the rest of the body. This is a very delicate an. There are two in a body and they have delicate lid
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