They work by bouncing laser beams back and forth along two orthogonal arms kilometers in length.

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问题 They work by bouncing laser beams back and forth along two orthogonal arms kilometers in length.

选项 A、perpendicular
B、collapsible
C、prototypical
D、mechanical

答案A

解析 根据two orthogonal arms(两条________手臂)和back and forth(来来回回,前前后后)可知,orthogonal的意思必须是不影响激光束在两条线路上(two…arms)上来回往复。四个选项中,只有perpendicular(垂直的,成直角的)符合语义,故答案为A项。collapsible意为“可折叠的”;prototypical意为“模范的,典型的”;mechanical意为“机械的;机械般的”,此三项均无 “两条线路”的特点,故排除。orthogonal意为“呈直角相交的;相互垂直的”。
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