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
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单项选择题
The machine must be operated (by hand). It isn’’t automatic.
A．mentally
B．annually
C．manually
D．heavily
单项选择题
One out of five American children suffers from dyslexia.
A．Right
B．Wrong
C．Not mentioned
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