单项选择题

______ of 70 years old, he decided to sail single-handed across the Pacific Ocean.

A．On the verge
B．At the risk
C．In the course
D．For the sake
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The relative success of particular countries in attracting tourists depends on their ability to provide particular tourism ______.
A．prospects
B．professions
C．products
D．procedures
单项选择题
The synthetic fibers produced in that plant ______ one third of all turned out in the area.
A．fill up
B．account for
C．consist Of
D．take out
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