正确答案: C

豆血红蛋白

题目：根瘤呈红色，因为根瘤细胞含有( )。

解析：C

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举一反三的答案和解析：

[单选题]Why did Jennifer try to stop her boyfriend?

Because she was afraid the train would kill him.

解析：【解析】由最后一段最后一句I saw the train coming and I was thinking he was going to die暗示可知。

[单选题]Don’t worry if you don’t understand everything.The teacher will ______ the main points at the end.

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