Question

Only one line can pass between two points.
TRUE OR FALSE

Answer 1

True in Euclidean Geometry (which is probably what you're working in). You can define a line by knowing any two points on that line. So if you have two points, and you create a line from that, you have just defined a UNIQUE line with those two points. Put two points on a piece of paper, now try drawing more than one line through them.

Answer 2

Only one "straight" line can pass between 2 points, but an infinite number of "curved" lines can pass between two points, so @mathjazz is correct :-)