rainfall，they form wide rings.In a dry year，they form narrow ones.

　　Scientists don't have to cut down a pine tree to study its rings.With a special tool，they can remove a narrow piece of wood from the trunk without harming the tree.Then they look at the width of each ring to see how much rain fell in the year it formed.

　　Some pines are hundreds of years old and have hundreds of rings.These rings form an annual record of past rainfall in the southwest.

　　【语篇解读】 本文主要讲了树的年轮。

　　43．We could infer from the story that________.

　　A．a tree grows faster when it has a lot of water

　　B．scientists can cut down trees to study tree rings

　　C．pine trees form wide rings every year

　　D．the ponderosa pine grows in the southwest

　　解析　推理判断题。由第三段第四、五、六句可知答案为A。

　　答案　A

　　44．A tree grows a new layer of wood________.

　　A．each week

　　B．whenever it rains

　　C．every year

　　D．every season

　　解析　细节理解题。由第二段第一句可得到答案。

　　答案　C

　　45．All in all，this story is about________.

　　A．why the tree trunks grow bigger

【2017届高考英语（重庆专用）二轮精练：选修9 unit4 Exploring plants单元测试】相关文章：

★ 2014高考英语（新人教版）一轮基础训练（8）A、B卷（附答案或解析）

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习短文改错专题训练：模式1 缺一词（含解析）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修8 unit5《Meeting your ancestors》

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习书面表达专题训练：技法4 巧妙的过渡连贯的衔接（含解析）

★ 2017届高考英语二轮复习课时训练：5（含解析）

★ 【三维设计】2017版（江苏专用）二轮复习练习：选修8 Unit 4《Films and film events》课时跟踪检测A卷（含解析）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习高考单词5大记忆法课件：3.谐音记忆法

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习书面表达专题训练：Ⅱ卷强化增分练 训练1（含解析）

★ 2017届高考英语二轮复习课时训练：19（含解析）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习写作增分锦囊课件：6 书面表达常见错误及对策