单项选择题

"Defied" in the 5th paragraph probably means ______. ( )

A．doubted
B．gave proof to
C．challenged
D．agreed to
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单项选择题
In scope and difficulty, the canals construction was most closely alike to that of the ______. ( )
A．Suez Canal
B．trans-Siberian Railroad
C．Taj Mahal
D．pyramids of Egypt
单项选择题
The isthmus of Panama is a ______. ( )
A．canal
B．narrow strip of hand
C．kind of crocodile
D．man who once ruled Panama
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