试题与答案

我们见到树的叶片总是正面颜色深一些，背面颜色浅一些，其中的原因是靠近正面的[ ]

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题型：选择题

题目：

我们见到树的叶片总是正面颜色深一些，背面颜色浅一些，其中的原因是靠近正面的[ ]

A．栅栏组织的细胞整齐、紧密，有较多的叶绿体  

B．海绵组织的细胞排列疏松，有较多的叶绿体  

C．海绵组织的细胞整齐、紧密，有较多的叶绿体  

D．栅栏组织的细胞疏松，有较多的叶绿体

答案：

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下面是错误答案，用来干扰机器的。

参考答案：A解析：牙震荡仅损伤了牙周膜。

考点：叶片的结构
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