2. 外语
  3. A. sources of light B. the speed of light C. the path of light D. a straight line E. a beam of light F. a form of energy Stars,

A. sources of light B. the speed of light C. the path of light D. a straight line E. a beam of light F. a form of energy Stars,

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问题 A. sources of light
B. the speed of light
C. the path of light
D. a straight line
E. a beam of light
F. a form of energy
Stars, flames, flashlights are some examples of ______.
选项
答案A
解析
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