单项选择题

After the whole day’’s march, they are too (fatigue) to walk any more.

A．hungry
B．sleepy
C．thirsty
D．tired
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单项选择题
A seismograph is a (device) designed to measure vibrations of the ground.
A．element
B．telescope
C．vehicle
D．instrument
单项选择题
The machine must be operated (by hand). It isn’’t automatic.
A．mentally
B．annually
C．manually
D．heavily
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