题目内容
（请给出正确答案）
[主观题]
The reference word "it" （Sentence 1 , Para. 3 ) refers to ______.A．the airB．the laser bea
The reference word "it" (Sentence 1 , Para. 3 ) refers to ______.
A．the air
B．the laser beam
C．the ocean
D．the submarine
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