Laser / device / concentrate / light waves / intense beam
Giải thích
Đáp án A
22/33
Choose the correct answer that complete these given words.
Laser / device / concentrate / light waves / intense beam.
Laser is a device which concentrates light waves into an intense light beam.
The laser is a device which concentrates light waves and an intense light beam.
Laser is a device concentrates light waves into an intense light beam.
The laser is a device to concentrate light waves to an intense light beam.
Đáp án A