神马作文网It is true that light travels in a straight line and never -
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It is true that light travels in a straight line and never -- it hits something that reflects it
A.turns until B.bends unless C.breaks when D.changes until
A.turns until B.bends unless C.breaks when D.changes until
从单词意思去考虑
turn 转弯,改变方向（很多意思,根据题意取这个）
bend 弯曲,弯腰
break 破坏
change 改变
所以B和C可以直接排除,A和D比起来,A的意思更明确,就是（光的）方向改变,更符合题意
turn 转弯,改变方向（很多意思,根据题意取这个）
bend 弯曲,弯腰
break 破坏
change 改变
所以B和C可以直接排除,A和D比起来,A的意思更明确,就是（光的）方向改变,更符合题意
It is known to all that light travels in straight lines.
英语：That light travels in straight lines is known to all.
In the figure above,QRS is a straight line and line TR bisec
in a straight line
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It's_common knowledge that light travels faster than sound
Gendo has drawn a line in the sand and all that is left is f