单项选择题

A．time
B．era
C．aspect
D．period
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单项选择题
A．calledB．knownC．by nameD．named
A．called
B．known
C．by name
D．named
单项选择题
From the second paragraph, we know that ______.
A．America is highly mechanized in agriculture
B．agriculture innovation is quite popular in U. S.
C．equipment is only available in fertilizing the plant
D．different machines are invented to do different laborious jobs
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