单项选择题

What does the passage mainly discuss

A．Railroad oppressing individuals in the U. S.
B．History of the U.S. railroads.
C．Railroad workers' working rights.
D．Law cases concerning the railroads.
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We managed to reach the top of the mountain, and half an hour later we began to ______ .
A．ascend
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The outline of the figure was barely ______ in the darkness.
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