单项选择题

Where is George now

A．Europe.
B．Here.
C．California.
D．Canada.
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单项选择题
A laser can be best described by______.
A．a device for stimulating atoms and molecules to emit light
B．an atom in a high energy state
C．a technique for destroying atom or molecules
D．an instrument for measuring light waves
单项选择题
The word it (line 5, para 1) refers to______.
A．light bulb
B．energy
C．molecule
D．atom
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