May : Happenings from the Past
May 5 , 1884
Isaac Murphy , son of a slave and perhaps the greatest horse rider in American history, rides Buchanan to win his first Kentucky Derby. He becomes the first rider ever to win the race three times.
May 9 , 1754
Benjamin Franklin’s Pennsylvania Gazette produces perhaps the first American political cartoon , showing a snake cut in pieces , with the words “Join or Die” printed under the picture.
May 11 , 1934
The first great dust storm of the Great Plains Dust Bowl, the result of years of drought (干旱) , blows topsoil all the way to New York City and Washington , D. C.
May 19, 1994
Jacqueline Lee Bouvier Kennedy Onassis, former first lady and one of the most famous people of the 1960s, died of cancer in New York City at the age of 64.
May 24, 1844
Samuel F. B. Morse taps (轻敲) out the first message, “What hath God wrought,” over the experimental long-distance telegraph line which runs from Washington, D. C, to Baltimore, Md.
小题1:We know from the text that Buchanan is _______________.
A．Isaac’s father
B．a winning horse
C．a slave taking care of horses
D．the first racing horse in Kentucky小题2:What is the title of the first American political cartoon?
A．Join or Die
B．Pennsylvania Gazette
C．What Hath God Wrought
D．Kentucky Derby小题3:In which year did the former first lady Jacqueline die?
A．1934
B．1960
C．1964
D．1994小题4:Which of the following places has to do with (与...有关)the first telegram in history?
A. Washington, D. C.
B. New York City
C. Kentucky
D. Pennsylvania
，所以初速度为是：
，抛出物体时，至少需要对物体做功
，抛出物体时，对物体施加的冲量最小值是
，