单项选择题

The tone of the passage can best be described as ______ .

A．humorous
B．argumentative
C．informative
D．critical
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单项选择题
By the end of ______ , many Americans felt it was necessary to have a faster way from the Atlantic Ocean to the Pacific Ocean.
A．Panama Revolution
B．the independence of Panama form Colombian
C．the Spanish-American War
D．1903
单项选择题
The pen ______ on the floor for ten minutes, but no one has picked it up.
A．is lying
B．has lain
C．has been lying
D．lay
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