单项选择题

Though steam engines have now passed the () of their usefulness, their heritage remains.

A. prime
B. era
C. epoch
D. dafe

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单项选择题

The cradle of oversea traffic and of the art of naval combats, the Mediterranean, the common () of all mankind, makes a tender appeal to a seaman.

A.estate
B.heritage
C.property
D.possession

单项选择题

A. run
B. running
C. wander
D. wandering

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