正确答案: C

角质化

题目：茎表皮细胞的外壁常( )。

解析：C

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举一反三的答案和解析：

[单选题]This is the first time we______ a film in the cinema together as a family.

saw

[单选题]30 Professor Williams keeps telling his students that the futureto the well-educated.

belongs

[单选题]—Would she mind playing against her former teammates?— She is willing to play against any tough players.

Not likely!

[单选题]构成生物体结构和功能的基本单位是组织。( )

错误

[单选题]一些菊科植物果实适应动物传播的特征是( )。

刺毛或倒钩

[单选题]We can infer from the passage that in England （ ）

many young people don’t like theatre