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【单选题】
流行性脑脊髓膜炎的细菌培养标本必须在采集后立即送检，主要因为（ ）A.
该菌离开人体后得不到营养
B.
细菌立即产生自身溶解酶
C.
严格厌氧，不能在空气中暴露
D.
对寒冷、干燥极为敏感，在体外极易自溶
E.
标本搁置容易污染
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皮皮学刷刷变学霸
举一反三
【单选题】The colour of the sky at the horizon depends on ______.
A.
the amount of light
B.
the condition of the atmosphere
C.
the time of the day
D.
the thickness of air
【单选题】According to the passage, the purpose of being weightless was to______.
A.
see what conditions are like in space
B.
prepare the young scientists for future work in space
C.
show the judges of the competition what they could do
D.
make the teams try out their ideas
【单选题】To ________ is to save and protect, to leave what we ourselves enjoy in such good condition thltt others may also share the enjoyment.
A.
conserve
B.
distort
C.
distract
D.
contrive
【简答题】简述Spark生态系统的优势。
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