Anyone who has ridden on a railroad train knows how rapidly another train (36) by when it is traveling in the (37) direction and conversely how it may look almost (38) when it is moving in the same direction. (39) a train at a station starts to move forward (40) gently that passengers feels no backward movement (41) .Then if they happened to (42) the window and see another train slide past on the next track, they have no way of knowing (43) train is in motion and which is at rest; (44) can they tell how fast either one is moving or in which direction The only way they can judge their (45) is by looking out the other side of the car for some fixed body of reference (46) the station platform or a single fight. Newton was (47) these tricks of motion, only he thought in terms of ships. He knew that on a calm day at sea a sailor can shave himself or drink soup as (48) as when his ship is lying m
A. like
B. love
C. devote
D. attach
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