单项选择题

Rising unemployment is ________ serious problems for the administration.

A．forcing
B．pressing
C．posing
D．providing
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单项选择题
The Erie Canal is mentioned in the passage because ________.
A．it ended just a few years later in a tremendous failure
B．it suffered from competition from railroads and trucks
C．it proved to be less profitable than its investors expected
D．its success led to the great American canal boom in the 1830s
单项选择题
The reasons why the inventions failed to deliver to investors the expected rewards include all the following except ________.
A．the policies of the states
B．the following innovations
C．the commercialization of the invention
D．the competition from the latter imitation
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