为了探究生长素（IAA）和乙烯（ACC是乙烯供体）对植物生根的影响，科学家用拟南芥下胚轴插条进行了一系列实验，结果如图所示．下列有关分析错误的是（ ）
单位正方体在一个平面内的投影面积的最大值和最小值分别为（ ）
A. He is sending an email to his friend.
B. This dress is for Amy.
C. The boys are playing football.
D. This girl is writing a letter.
E. We had a happy time in the park.
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