单项选择题

Under-used computer equipment can proliferate in large companies without a system to monitor purchasing.

A．know
B．order
C．screen
D．watch
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单项选择题
The purpose of the experiments was to fund out how the clock works.
A． Right
B． Wrong
C． Not mentioned
单项选择题
the identification of the internal clock may help to relieve human sleeping problems.
A． Right
B． Wrong
C． Not mentioned
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