单项选择题

Many factory workers find their jobs tiresome.

A．difficult
B．pointless
C．profitable
D．boring
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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
单项选择题
The plane for Riode Janeiro will take off at 6.00 p. m.
A．depart
B．land
C．approach
D．refuel
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