在液体（固体）表面产生足够的可燃蒸气，遇火能产生一闪即灭的火焰的燃烧现象称（）。
A. 闪点
B. 闪燃
C. 燃点
D. 爆燃
The woman ____ is talking to my mother is a friend of hers.
A. whose
B. who
C. whom
D. which
Because of my poor memory, all ____ you told me has been forgotten.
A. that
B. which
C. what
D. as
Do you remember those days ____ we spent along the seashore very happily?
A. when
B. where
C. which
D. who
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