单项选择题

Nearly all trees have seeds that fall to the earth, take root, and eventuall______

A．generate new seeds
B．new seeds generated
C．generates new seeds
D．new seeds are generated
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单项选择题
What ______ about that article in the newspaper was that its writer showed an attitude cool enough, professional enough and, therefore, cruel enough when facing that disaster-stricken family.
A．worked me out
B．knocked me out
C．brought me up
D．put me forward
单项选择题
Crew chiefs supervisedengines, switches and lights that told them how each item of equipment was functioning.
A．observed
B．preserved
C．monitored
D．nurtured
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