27. According to humans’ using lasers, lasers may be useful or……(1) to themselves. The….(2) can use lasers in surgery
to treat many diseases while many….(3) scientists test them to kill their enemies.
When lasers…….…(4) used as a dangerous weapon many people will die of human intelligence.
Bạn đang xem 27. - BAI TAP TU LUAN CHO HS HAM HOC CUA THAY TUAN AVHN3
