Which of the following phonetic transcriptions is right for the “cold”?
A:/kold/
B:/kəud/
C:/kod/
D:/kəuld/
一位美国史学家描述道:“……乘船在悲惨的‘中段航程’中横渡大西洋,这些黑色‘货物’上了镣铐,锁在甲板上,没有卫生设备,他们忍受着可怕的待遇……”“黑色‘货物”’将会被贩卖到( )
— ______ is the Changjiang River in China, do you know?— Yes, it's about 6,380 kilometers long.
血红蛋白分子中含574个氨基酸,共有4条肽链。在形成此蛋白质分子时脱下的水分子数目和其含的肽键数目分别是 ( )