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Mời các bạn học sinh tham khảo Đề thi KSCĐ lần 4 môn tiếng Anh lớp 12 năm 2017-2018 - THPT Ngô Gia Tự - Mã đề 485 tài liệu tổng hợp nhiều đề thi khác nhau nhằm giúp các em ôn tập và nâng cao kỹ năng giải đề. Chúc các em ôn tập hiệu quả và đạt được điểm số như mong muốn! | electric magnet in a doorbell, all are powered by electricity. An electric current can be made with equal ease to heat the huge mass of molten metal in a furnace, or to boil a jug for a cup of coffee. Other than atomic energy, which has not as yet been harnessed to the full, electricity is the greatest power in the world. It is flexible, and so adaptable for any task for which it is wanted. It travels so easily and with incredible speed along wires or conductors that it can be supplied instantly over vast distances. To generate electricity, huge turbines or generators must be turned. In Australia, they use coal or water to drive this machinery. When dams are built, falling water is used to drive the turbines without polluting the atmosphere with smoke from coal. Atomic power is used in several countries but there is always fear of an accident. A tragedy once occurred at Chernobyl, in Ukraine, at an atomic power plant used to make electricity. The reactor leaked, which caused many deaths through radiation.
