单项选择题

Why did the author write the passage

A．To outline history.
B．To outline modern practices.
C．To explain traditions.
D．To explain a birth cycl
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单项选择题
Wiry does the author most likely mention George Washington in the first paragraph
A．He was President at the time the Erie Canal was built.
B．He was involved in pioneering efforts to build canals.
C．He successfully opened the first canal in the United States.
D．He commissioned engineers to study the possibility of building the Erie Canal.
单项选择题
Which of the following, according to paragraph 3 was NOT a principal method of launching a ship
A．Sideways.
B．Lowering.
C．End-on.
D．Floatin
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