Which of the following describes the typical gateway arch？A．The vertical lines come togeth
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Which of the following describes the typical gateway arch？
A．The vertical lines come together at the top.
B．The vertical lines converge in the middle.
C．The base is smaller than the top.
D．The slope of each shoulder is different.
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正确答案：A
答案在文章第三段第二、三句：宽大的底部，两端向上延伸，两边倾斜在顶端形成中心点。[A]项的描述与此相符：垂线顶端相交；[B]项说垂线中间会合，这样形成的是叉线；[C]项说底部比顶端小，这不是门廊的形状；[D]项说两边线的斜度不同，这样不符合对称性。