单项选择题

The tone of the passage can best be described as（）

A．argumentative
B．informative
C．humorous
D．sarcastic

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单项选择题

From the information in the passage, it can be concluded that the United States （）

A．wanted to build a canal because it was considering starting a war
B．built a canal through Panama at the risk of ruining relations with, Colombia
C．believed that a canal through Nicaragua would be profitable
D．had lost the Spanish-American War

单项选择题

______ for your laziness, you could have finished the assignment by now.

A．Had it not been
B．Weren't it
C．It were not
D．Had not it been