正确答案: A

正确

题目：树皮中的外树皮全是死组织，内树皮主要是活组织。( )

解析：A

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举一反三的答案和解析：

[单选题]蓝藻的光合色素分布在载色体上。( )

错误

[单选题]豆角的胎座是( )。

边缘胎座

[单选题]The author used to think of her mother’s English as ______.

imperfect

[单选题]On which days did the tourists spend most of their time on the boat?

Monday and Wednesday.