正确答案: B

错误

题目：幼根的表皮细胞主要起保护作用。( )

解析：B

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举一反三的答案和解析：

[单选题]Why did David decide to leave school and start working?

He lost interest in school studies. D． He wanted to earn his own living.

[单选题]植物的嫁接最容易。

木本

[单选题]姜科植物是单子叶植物虫媒传粉的最高级类型。( )

正确

[单选题]簇生叶序是每个节上生3枚或3枚以上的叶。( )

错误

解析：解析：将“簇生叶序”改为“轮生叶序”。

[单选题]________ many times, he finally understood it.

Having been told

[单选题]

believe in

[单选题]叶基二裂片向两侧外指，称( )。

戟形