单项选择题

The author failed to learn Greek because______.

A．he lacked sufficient intelligence
B．he could not master the writing system
C．of his parents' attitude to the subject
D．the wrong teaching approach was used

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单项选择题

What can be inferred from the information about railroads in 1849 in the last paragraph

A．They were being planned but had not yet been built.
B．They were seriously underdeveloped.
C．They had begun to compete with the Erie Canal for traffic.
D．They were weakened by the expansion of the canal.

单项选择题

According to the passage, the Erie Canal connected the______.

A．Potomac and Ohio rivers
B．Hudson River and Lake Erie
C．Delaware and Potomac rivers
D．Atlantic Ocean and the Hudson River