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【单选题】
下列实验现象的描述，你认为正确的是（ ）A.
硫在空气中燃烧火焰呈淡蓝色，在氧气中呈蓝紫色，二氧化硫
B.
磷在氧气中燃烧产生大量白色烟雾，并放出热量
C.
氢气在空气中燃烧火焰呈紫色，并放出热量
D.
在加热的条件下，H 2 使黑色的氧化铜变成红色，同时有水珠生成
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举一反三
【单选题】Not until all the fish died in the lake __________ how serious the pollution was.
A.
did the villagers realize
B.
the villagers realized
C.
realized the villagers
D.
do the villagers realize
【单选题】It was not until all the fish died in the river_____the villagers realized the serious pollution.
A.
where
B.
that
C.
what
D.
which
【单选题】Not until all the fish die in the river ____ how serious the pollution was. [ ]
A.
did the villagers realize
B.
the villagers realized
C.
the villagers realized
D.
didn't the villagers realize
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