阅读短文，并根据短文内容完成下列各题。

      Hello! My name is Maddy. I'm a boy. I have a brother and a sister. I am younger than my brother. I am

older than my sister. I live in Canada. My grandfather lives in the U. S.

1. What's the author's (作者的) name?

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2. Is Maddy older than his brother?

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3. Is his sister younger than him?

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4. Where does Maddy live?

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5. Does his grandfather live in the U. S.?

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成熟度与叶片结构密切相关．随着成熟度的增加．细胞（）气孔开张．整个叶组织呈现出疏松多孔状态。

A.体积增大．间隙不增加

B.体积增大．间隙增加

C.逐渐纵向拉长．横向拉开

D.体积不增大，同隙增加．