单项选择题

Passage One Questions 11 to 13 are based on the passage you’ve just heard of.

A.Travel by river is more expensive than taking a wagon over country roads.
B.If there were not enough rivers, people there built shallow canals.
C.Crops from New York were sent to Atlantic ports through the Great Lakes.
D.The Erie Canal was built to connect New York with the mouth of the Hudson.