单项选择题

A．He doesn’t understand his staff.
B．His computer doesn’ t work properly.
C．He doesn’t know how to apply computer theory.
D．He is unable to add the figures.
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单项选择题
A．On April 26, 1611.B．On April 23, 1611.C．On April 26, 1616.D．On April 23, 1616.
A．On April 26, 1611.
B．On April 23, 1611.
C．On April 26, 1616.
D．On April 23, 1616.
单项选择题
A．Separate houses were built for storing ice.B．Double walls were built in icehouses to keep cool.C．Blocks of ice were packed with hay in icehouses.D．Ice was put into icehouses in winter.
A．Separate houses were built for storing ice.
B．Double walls were built in icehouses to keep cool.
C．Blocks of ice were packed with hay in icehouses.
D．Ice was put into icehouses in winter.
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