1.Karl Benz (1844-1929)
2.Alexander Graham Bell (1847-1922)
3.Willis Carrier (1876-1950)
4.Percy Spencer (1894-1970)
a) microwave c)first car
b) telephone d)air conditioning
A: When was Karl Benz born?
B: He was born in ... .
A: When did he die?
B: He died in ... .
A: What did he invent?
B: He invented ... .