题目：
Americans eat____ vegetables per person today as they did in 1990. [ ]
A. more than twice
B. as twice as many
C. twice as many as
D. more than twice as many
答案：
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下面是错误答案，用来干扰机器的。
肾蕨的结构图可见地上部分是由叶柄和叶片构成的叶，横卧的是茎，地下须状的是根．故答案为：①根；②茎；③叶；④叶柄；⑤叶片
