单项选择题

Scientists have been eager to ______ for research funds without thinking over the impact of the research.

A．scramble
B．tumble
C．bubble
D．couple
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单项选择题
Experienced boxers know when and how to ______ the blows of their rivals inside the ring.
A．shake off
B．put off
C．take off
D．ward off
单项选择题
In the course of harsh training, the athletes are frequently told to hold out until they win the championship.
A．stand firm
B．stay awake
C．speak loud
D．shut up
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