______lines are, by definition, lines on the same plane that never join.

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问题 ______lines are, by definition, lines on the same plane that never join.

选项 A、Lateral
B、Intersecting
C、Vertical
D、Parallel

答案D

解析 名词辨析题。parallel意为“平行的;类似的”,parallel lines意为“平行线”,符合句意。lateral意为“侧面的,横向的”;intersecting意为“相交的,交叉的”;vertical意为“垂直的,直立的”。
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