A camera takes light rays bounced off objects and _____ them on a sheet of a film.
A. concentrates
B. mixes
C. combines
D. focuses
A. concentrates
B. mixes
C. combines
D. focuses
【答案】
A. concentrates
B. mixes
C. combines
D. focuses
A. concentrates
B. mixes
C. combines
D. focuses
【答案】
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