Most brids find it safe to sleep in the trees,but _________ they have eggs or young chicks,they don't use a nest.
选项:
A:
why
B:
how
C:
unless
D:
where
why
how
unless
where
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how to come
B:how to go to
C:where is
D:why to go
crack on
crack down
open crack
crack open
A、gross weight
B、net weight
C:C、theoretical weight
D、tare weight
easier
quicker
harder
slower
during this time
B:for once
C:once again
D:for a time
Eggs serve as an enduring symbol of new life.
B:Eggs have an oval shape appealing to artists.
C:Eggs reflect the anxieties of people today.
D:Eggs provide a unique surface to paint on.
Because they can be applied in scientific experiments.
Because they are greatly admired by scientists and inventors.
Because they are overlooked by historians and philosophers.
Because they can be served as a source of basic innovations.
government.
lot
B:prepared
C:supervise
D:file
E:hand
the , the
the ,/
/,the
D:/,/
when
B:how
C:where
D:why
When
B:how
C:where
D:why
cheapest
B:cheaper
C:more expensive
most expensive
have been placed
B:B.have been plagued
C:
.have placed
have plagued