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【单选题】
维生素B12结构中含有什么元素A.
Fe
B.
Co
C.
Mg
D.
Cu
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【单选题】问题3
A.
She was fascinated to see the beautiful scenes.
B.
She fell asleep and wasn't aware of the touch.
C.
The bus was crowded and noisy.
D.
The bus made passengers lose their balance.
【单选题】AIDS is said ______ the biggest health challenge to both men and women in that area over the past few years.
A.
that it is
B.
to be
C.
that it has been
D.
to have been
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