... electrical tranmission of sound by day Graham Bell invented the telephone ĐÁP ÁN ĐỀ THI HS GIỎI VÒNG HUYỆN NĂM HỌC 2008- 20 09 I điểm ( Mỗi câu 0,25) 1a, 2a, 3b, 4d, 5b, 6a, 7a, 8b, 9b, 10a, 11b, ... practical thinker and a man of action In Boston, where he worked by day as a teacher of the deaf, he worked far into the night experimenting with the electrical transmission of the sound This led ... plough, take a soldier _(4) a dangerous situation in battle, _ (5) most of the other things that have attracted painters and writers to the animal ever (6) tha dawn of history The horse is...