单项选择题

A．To make coins lighter.
B．To conserve silver.
C．To use up surplus copper.
D．To make coins last longer.
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单项选择题
A．Sleep is the first thing that can be sacrificed when one is busy.B．They need more sleep to feel ideally vigorous.C．To sleep is something one can do at any time of the day.D．Less sleep does harm to their health.
A．Sleep is the first thing that can be sacrificed when one is busy.
B．They need more sleep to feel ideally vigorous.
C．To sleep is something one can do at any time of the day.
D．Less sleep does harm to their health.
单项选择题
A．Because it’’s too late.B．Because he doesn’’t know her.C．Because she is the best student.D．Because she is a friend of the woman.
A．Because it’’s too late.
B．Because he doesn’’t know her.
C．Because she is the best student.
D．Because she is a friend of the woman.
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