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当炉火快要熄灭时，往里面撒一把盐，火将变旺起来，其原因是( )

A．盐里的水分能燃烧

B．盐能助燃

C．盐能燃烧

D．盐里的水分助燃

—I wonder why Mr Green hasn't showed up at the meeting yet.

—I'm not sure，but he________in a traffic jam driving here.

A．could be stuck

B．might have been stuck

C．might be stuck

D．must have been stuck

手工活动

划线时采用拉线、吊线、线坠、直角尺和直尺互相配合，通过投影来引线的方法称为拉线与（）