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【单选题】
能在无生命培养基中生长的最小微生物是A.
立克次体
B.
衣原体
C.
支原体
D.
螺旋体
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反馈参考答案：
举一反三
【单选题】At the airport, I could hear nothing except the roar of aircraft engines which all other sounds.
A.
diminished
B.
drowned
C.
dwarfed
D.
devastated
【单选题】Often he _________ sit for hours doing nothing at all when he was in low spirits.A．shouldB．would
A.
23. Often he _________ sit for hours doing nothing at all when he was in low spirits. A．should
B.
would
C.
might
D.
Could
【单选题】All flight ____ because of the snowstorm, many passengers could do nothing but stay at the airport.
A.
had been cancelled
B.
were cancelled
C.
having been cancelled
D.
have been cancelled
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