单项选择题

A．protected
B．covered by
C．like
D．covering
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单项选择题
What de we learn about much of the drained land in Holland
A． Above sea level.
B． Below sea level.
C． At a changing level.
单项选择题
A．thousand ofB．thousands ofC．thousandsD．thousand
A．thousand of
B．thousands of
C．thousands
D．thousand
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