When was the pacemaker invented? John Hopps: John Hopps was born on May 21, 1919 in Winnipeg, Manitoba, Canada, and in 1941, he earned a bachelor's degree in electrical engineering from the University of Manitoba. In 1942, he joined the National Research Council of Canada (NRC), and his...
It was a very hot afternoon. The old man was pulling grass in his fields when he felt a pain in his left hand. He at once realized he had been bitten by a poisonous snake. In no time he wrapped(缠绕)a cloth tightly around his arm to stop the poison(毒)getting to his heart. ...
Howteawasinventedbyaccident 1.Whenwasteafirstdrunk? 2.Howwasteainvented? 3.Whowascalled“thesaintoftea”? Itwasfirstdrunkabout5,000yearsago. Someleavesfromateaplantfellintothe boilingwater.Itproducedanicesmelland tasteddelicious.Thisishowteawasinvented. 3bReadthepassageagainandanswer thequestions. LuYu...