单项选择题

A tuning fork is a narrow, two-pronged steel bar that when tuned to a specific musical pitch retains its tuning almost indefinitely.

A．uncertainly
B．inaudibly
C．endlessly
D．magically
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单项选择题
Many factory workers find their jobs tiresome.
A．difficult
B．pointless
C．profitable
D．boring
单项选择题
A neutron is so tiny that it would take ten trillion of them to cover a square inch.
A．indefinite
B．variable
C．minuscule
D．intangible
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