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【单选题】
下列关于双子叶植物叶的描述，错误的是 ( )A.
叶脉中的维管束都没有形成层，所以不能长粗
B.
木质部靠近上表皮，韧皮部靠近下表皮
C.
大的叶脉维管束下方常有发达的机械组织，因此叶片的下面常有显著的凸出
D.
最小的叶脉，木质部可能仅为一个螺纹管胞
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【单选题】Why do parents urge their children to apply to more school than ever?
A.
they want to increase their children chances of entering a prestigious college.
B.
they hope their children can enter a university that offers attractive scholarships.
C.
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D.
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A.
To train the children to be professional boxers.
B.
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C.
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D.
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