单项选择题

What is the talk mainly about

A．The problems caused by the Revolutionary War.
B．How some people became rich in the late 1700's.
C．The importance of providing for a tax system in the Constitution.
D．Motives for creating the United States Constitution.

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单项选择题

What can be inferred about the views of the historians

A．They are not influenced by government policy.
B．They are opinions that have no basis in fact.
C．They are affected by the conditions of the time in which they are written.
D．They would be more accurate if historians followed one ideology.

单项选择题

According to the professor, what was the major change in the agriculture during the 19th century

A．Crop production became increasingly specialized.
B．Economic depressions lowered the prices of farm products.
C．New banking laws made it easy to buy farmland.
D．The United States increased its agricultural imports.