单项选择题

A．He is a computer supplier.
B．He is a computer designer.
C．He is a computer repairman.
D．He is a computer technician.
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单项选择题
A．Around 1400.B．Around 1900.C．Around 900.D．Around 400.
A．Around 1400.
B．Around 1900.
C．Around 900.
D．Around 400.
单项选择题
A) By prediction. B) By recording. G) By observation. D) By examination
A) By prediction. B) By recording. G) By observation. D) By examination
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