单项选择题

What causes the growth of the US economy about 200 years ago

A．The new technology used to build roads.
B．The ability to transport goods over land.
C．The trade in grain and cotton.
D．The linking of smaller local roads into one long roa
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单项选择题
President Obama is putting off a trip to Indonesia and Australia just for______.
A．his health
B．terrorist attack
C．health care reform proposal
D．tax reform proposal
单项选择题
______is the most important feature of John Mogger’s method of teaching the alphabet.
A．How to write letters of the alphabet
B．How to combine the letters into simple words
C．How to communicate with family members
D．How to deal with problems
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