Samuel Morse invented ______.

Samuel Morse invented ______.
A、the steamboat
B、the telegraph
C、the cotton gin
D、the reaper
【正确答案】：B
【题目解析】：The great American inventors include Robert Fulton（the steamboat）; Samuel Morse（the telegraph）; Eli Whitney（the cotton gin, interchangeable parts）; Cyrus McCormick（the reaper）参见教材P253。