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

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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