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【单选题】
不属于薄膜开关结构的是:( )A.
面膜层
B.
面膜背胶
C.
保护层
D.
隔离层
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【简答题】Spell the past tense of the word "magic".
【简答题】Spell the past tense of the word "notice".
【单选题】No light ____ in the house for the past two evenings, one of the neighbors broke in and found the old lady in her chair.
A.
being visible
B.
to be visible
C.
has been visible
D.
having been visible
【单选题】The reason why there still needs improvement in the past view of Archaeopteryx is that
A.
fossils of those earliest birds haven't been discovered yet.
B.
the wishbone they studied is just so-called wishbone.
C.
there was no study of the role of its brain and some faculties in flight.
D.
Archaeopteryx is regarded as the earliest known bird.
【单选题】AIDS is said_______ the biggest health challenge to both men and women in the earth over the past four years.
A.
that it is
B.
to have been
C.
that it has been
D.
to be
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