单项选择题

They provide a means of keeping ______ of the thousands of journal papers that are published monthly or quarterly.

A．track
B．contact
C．relation
D．steps
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单项选择题
From observers' estimates of the brightness of the fireball, he ______ that the body in the space was between 40 feet and 260 feet in diameter.
A．deduced
B．reduced
C．induced
D．produced
单项选择题
The local people could hardly think of any good way to ______ poverty they had endured.
A．shake off
B．ward off
C．put off
D．take off
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